Used Maeda Crawler Crane for sale (5,378)

Condition: ready for operation (used), functionality: fully functional, fuel type: diesel, empty load weight: 3,800 kg, maximum load weight: 2,780 kg, operating hours: 2,285 h, Equipment: steel tracks, For sale: a Maeda metal-tracked crane (with rubber pads) in perfect condition. It is equipped with a Komatsu diesel engine and requires minimal space. It is ideal for use in confined areas. Blsdpszq Dlpofx Afmjk

Condition: new, functionality: fully functional, power: 7.5 kW (10.20 HP), fuel type: electric, color: green, overall weight: 2,880 kg, lifting power: 2,980 kg/m, lifting height: 16,950 mm, tire size: 950 × 180 mm (rubberen rupsen), tire condition: 100 %, mast type: telescopic, Year of construction: 2024, Equipment: UVV, adjustable boom, crane, hydraulics, low noise, onboard computer, rubber tracks, === KEY SPECIFICATIONS === Year of manufacture: 2024 Operating hours: New Max. lifting capacity: 2,980 kg (at 1.8 m) / 1,000 kg (at 4.7 m – jib) Max. lifting height: 16.95 m Max. working radius: 14.3 m Drive system: Fully electric (battery powered) Remote control: Yes (radio remote, proportional) Jib: Included (3-section, hydraulic telescopic) Attachments / additional equipment: Hydraulic winch, hydraulic telescopic jib, remote control, LED work lights, safety valves, tilt alarm, datalogger, non-marking rubber tracks Track type: Rubber tracks (non-marking) Track size: 950 × 180 mm Track condition: New Weight: approx. 2,875 kg CE certification: Yes === HIGHLIGHTS === Fully electric mini crawler crane (zero emission) Ideal for indoor and emission-restricted environments Low noise operation Fully automatic 5-section telescopic boom 360° continuous slewing with precise control Fully variable hydraulic outriggers Low ground pressure, suitable for sensitive surfaces CE certified and ready for immediate use === CONDITION === Bsdpsxg A Ibsfx Afmjlk New machine – factory condition, unused and immediately available. Fully tested and inspected. Inspection available upon request. === LOCATION & DELIVERY === Located in Sittard, the Netherlands. Worldwide delivery possible. Price: €149,500 (EXW / excluding VAT) The Maeda MK 3053 CB is a compact and powerful fully electric mini crawler crane, offering a maximum lifting height of 16.95 metres and a lifting capacity of up to 2.98 tonnes. Thanks to its battery-powered electric drive system, this crane is perfectly suited for indoor applications and environments with strict emission requirements. Its compact dimensions and precise radio remote control make the MK 3053 CB ideal for installation, glazing and maintenance work where precision, low noise and zero emissions are essential. === DELIVERY === Crane loading available on request. Flexible shipping options tailored to destination and logistical requirements. All transport is handled professionally by the Collé Rental & Sales logistics team.

Condition: new, functionality: fully functional, fuel type: hybrid, color: blue, overall weight: 2,900 kg, empty load weight: 2,900 kg, operation weight: 2,900 kg, lifting power: 2,980 kg/m, tire condition: 100 %, Year of construction: 2024, operating hours: 1 h, Equipment: adjustable boom, crane, hydraulics, low noise, onboard computer, rubber tracks, 🔧 Key Specifications: • Year: 2024 • Operating hours: 1 h (NEW) • Max capacity: 2,980 kg (main boom) / 1,000 kg (with jib) • Max lifting height: 16.95 m (with jib) / 12.0 m (main boom) • Max working radius: 14.3 m • Power: Bi-energy (diesel + electric + battery) • Remote control: Fully proportional radio control • Hydraulic winch: Yes • Jib: Hydraulic telescopic jib included • Undercarriage: Variable crawler gauge • Outriggers: Automatic multi-position outriggers • Tracks: Rubber tracks (non-marking) • Weight: approx. 2,900 kg • CE certification: Yes ✨ Highlights: ✅ Bi-energy spider crane (diesel + electric operation) Bedjy Hqhrjpfx Afmolk ✅ Suitable for indoor & zero-emission working ✅ Fully proportional remote control ✅ Hydraulic winch for precise lifting operations ✅ Hydraulic telescopic jib for extended reach ✅ Variable crawler gauge for maximum stability ✅ Automatic multi-position outriggers ✅ Compact design for confined spaces ✅ Ready for immediate deployment ⚙️ Condition: New machine — never used. Factory-new condition with full inspection and CE certification. 🌍 Location & Price: 📍 Sittard, Netherlands 🚚 Worldwide delivery available 💰 Price: €119,500 (EXW / excl. VAT) 🚚 Delivery: • Crane loading available • Flexible transport options • Handled by Collé Rental & Sales logistics

Condition: used, Year of construction: 2008, empty load weight: 2,300 kg, fuel type: diesel, Used articulated boom lift for sale: Working height: 8.8 meters Weight: 2300 kg Lifting capacity: 150 kg Dimensions: 4.08 x 1.65 x 1.96 meters Kubota 3-cylinder engine Diesel Price per unit: €13,500,- excluding VAT 6 units in stock!! Bedpeyw Uczjfx Afmelk

Condition: good (used), color: yellow, lifting height: 16,400 mm, mast type: telescopic, Year of construction: 2014, operating hours: 1,441 h, Drivetrain Make of engine: Komatsu Weights Empty weight: 10.250 kg Functional Bodpoxf Ec Esfx Afmslk Mast length: 463 cm Lifting capacity: 4.900 kg Dimensions of cargo space: 502 x 236 x 280 cm CE mark: yes Condition Technical condition: good Visual appearance: good Other information Front tyres / undercarriage remaining: 80 Rear tyres remaining : 80 Maximum lifting capacity at end of jib: 900 kg Delivery terms: EXW Carrier engine: Komatsu SAA4D95LE-5, 42.8 kW Production country: JP Additional information Please contact Sales Department Collé Sittard for more information = Additional options and accessories = - Hook blocks

Year of construction: 1984, condition: used, 1x Wimag gantry crane Load capacity: 20,000 kg Bljdpfx Afjyx Ercsmjk Span: 16 m (adjustable to 12 m in 500 mm increments) Outreach: 0 m Lifting height above rail: 7.5 m Hook travel: 25 m Radio remote control Cable reel suitable for 40 m

Condition: used, 1x gantry crane Working load: 2 x 10,000 = 20,000 kg Span: 24 m Cantilever: 1 x 3 m Lifting height above rail: approx. 8 m Hook travel: 8 m Bodpfeyx Dyfsx Afmelk Radio control Complete with crane rail

Year of construction: 2023, condition: like new (used), functionality: fully functional, 1x BKRS gantry crane Bedpfx Ajyx Dv Tjfmjlk Working load: 2 x 20,000 = 40,000 kg Span: 29 m Cantilever: 2 x 8.9 m Lifting height above rail: 10 m Hook path: 13.5 m Radio remote control Cable reel suitable for 90 m Complete with crane rail UIC60, length: 2x 180 m

Condition: like new (used), functionality: fully functional, Year of construction: 2019, 1x BKRS gantry crane Rated load: 50,000 kg Span: 21.5 m Bodpfsyx Dlhjx Afmjlk Cantilever: 2 x 6 m Lifting height above rail: 10 m Hook travel: 45 m Radio remote control Cable drum suitable for 110 m Complete with crane rail UIC60 length: 2x 110 m The crane was used for a tunnel boring project Demag components

Condition: used, functionality: fully functional, Year of construction: 2009, Span: 35 m Load capacity: 130 tons Including 2 x 75 m rail A75 Bljdot D H H Aspfx Afmok Drawings on request / drawing on request No hoist unit / no hoist Can be adapted to an overhead/gantry crane

Condition: used, Year of construction: 2008, Maeda mc235 Bj 2008 Bljdpfexc Ek Rex Afmek Hours Hook height 6.30cm Load 2000kg Petrol engine Not sold within the EU No CE

Condition: excellent (used), functionality: fully functional, DEMAG 635 H13 hoist, complete Load capacity 10,000 kg, 4/1 reeving Good condition Bsdpfxjv T Tige Afmelk Free delivery within Germany! Info: 20,000 DEMAG spare parts and components in stock! Demag parts warehouse

Condition: refurbished (used), Various Crane / Depa pumps, various designs and sizes, cpl. refurbished and available at short notice Bjdpfx Aefcy A Isfmjlk

Condition: new, functionality: fully functional, fuel type: hybrid, overall weight: 55,000 kg, Year of construction: 2026, *All of our products are made with care and covered for 1 year warranty! *Installation and Operator Training FREE Fabo tracked jaw crusher FTJ 11-75 is a complete mobile system which moves on hydraulically driven tracked system with 1 km/h speeds and combination of a vibrated grizzly feeder, 1070x760 mm jaw crusher, foldable stockpile conveyors, control unit and electric generator. In today's conditions and technological processes, businesses are beginning to think about how to make their field of activity more efficient. As they make it more efficient, they always take into consideration factors such as the operationally of the machines they use, their low cost and staffing needs. Our Tracked Crushers can crush with high performance even on the most demanding mine sites with its specially designed body and compact structure. Customization can be done to our tracked systems by Jaw Crusher, Primary and Secondary Impact or Cone Crusher. All necessary equipment for the process is combined only single chassis and processing equipment is driven by electrical motors. Overall production capacity is 150-300 tph Advantages of Tracked Crushers; -Heavy-duty walking tracks can reach places where ordinary machines cannot reach. -It has the appropriate dimensions and sound level to crush construction waste in the city. -The fuel consumption of the generator and the travel track units is highly economical. -System maintenance and management is very easy with latest technology control software. TECHNICAL SPECIFICATIONS: -Model: FTJ 11-75 -Production Capacity: 150 – 300 tons per hour Bljdpfx Afjynf Iusmjk -Maximum Feeding: 700 mm -Crusher Type: Jaw Crusher -SIZE: 1070x760 mm -Generator: 300 kva -CSS Setting: 45 – 160 mm -Weight: 55000 tons -Dimensions: 2900x3500x14.500mm – Low investment and operation cost – Zero substructure preparation – Easiness at usage and maintenance – Easy assembly and disassembly advantages. FOR FURTHER INFORMATION PLEASE FEEL FREE TO CALL US!!!

Condition: excellent (used), functionality: fully functional, 8 large, high-power DEMAG travel drives complete with gearbox and travel wheel / DRS wheel block for crane bridge From large DEMAG spare parts stock, see also my other offers Low hours, very good condition, offered due to dismantling of factory hall Motor: ZBF100 A4 B050 Gearbox: ADK70 QD Wheel: DRS 315 (manufacturer's new price approx. €3,000.00 net per unit) Price: €4,490.00 each, complete For purchase of 8 units: €3,490.00 each net Info: We have over 20,000 DEMAG items in stock! Check my other offers from stock as well! Bedpjv T Tf Uefx Afmolk

Condition: new, functionality: fully functional, overall weight: 24,000 kg, chain condition: 100 %, Year of construction: 2026, machine/vehicle number: MYC1500x6000F4000, Crawler Mobile Mud Stone Separator – Model MYC1500×6000F400O The MYC1500×6000F400O Crawler Mobile Mud Stone Separator is a high-performance soil and stone separation machine developed by Henan Mingyuan Heavy Industrial Equipment Co., Ltd. It is designed for efficient separation of clay, mud, and fine soil from mixed materials such as sand, gravel, and construction waste. With its crawler-type mobility, large-capacity drum screen, and intelligent control system, this model provides a flexible and reliable solution for material cleaning and classification in complex working environments. Applications The MYC1500×6000F400O is widely used in: Sand and gravel production: Removes clay and impurities from raw aggregates, improving product quality. Construction waste recycling: Separates soil and debris for reuse of clean aggregates. Mining and quarrying: Pre-screens and washes ores, removing sticky soil before crushing or beneficiation. Infrastructure and road construction: Cleans and classifies soil and stone for foundation preparation. Municipal and river dredging projects: Separates sediment, stones, and debris from dredged materials. Its crawler chassis allows easy movement on muddy or uneven ground, making it ideal for on-site operations where fixed installations are not practical. Main Features 1. Crawler Mobile Design Equipped with a heavy-duty crawler chassis and hydraulic drive, the machine can move flexibly on various terrains. It eliminates the need for additional transport equipment, reducing setup time and improving efficiency. 2. High-Efficiency Drum Screening The 1500 mm diameter and 6000 mm long rotary drum provide a large screening area and high throughput. The wear-resistant mesh panels ensure long service life and easy maintenance. The optimized screen aperture effectively separates mud and fine soil from larger aggregates. 3. Integrated Cleaning System Internal spiral blades and high-pressure spray nozzles work together to wash and separate sticky materials. This dual-action cleaning ensures clean aggregates that meet construction and production standards. 4. Intelligent Control The PLC control system allows adjustment of drum speed, water flow, and feed rate according to material conditions. Automatic overload protection and fault alarms enhance safety and reliability. 5. Energy-Saving and Eco-Friendly Bodpfxsy Dz U Do Afmslk The hydraulic-electric hybrid drive reduces fuel consumption and emissions. The water recycling system minimizes water usage, making it suitable for environmentally sensitive areas. 6. Easy Maintenance Modular design and accessible components simplify inspection and servicing. Quick replacement of wear parts reduces downtime and maintenance costs. 7. Strong Adaptability Capable of handling clay-rich soil, river sand, construction debris, and weathered rock. Adjustable screening parameters make it suitable for different particle sizes and moisture levels. Technical Parameters Specification Model:MYC1500×6000F400O Screen Typ: roller screener Roller screener width/:1500 mm Roller Screener Length:6000 mm Feeding Size≤ 600 mm Capacity: 80–300 t/h (depending on material) Power System Diesel engine + hydraulic drive Mobility:Crawler-type chassis Control System PLC intelligent control Water System High-pressure spray, adjustable flow Discharge Dual outlet for clean stone and mud Weight :Approx. 22 tons Dimensions (L×W×H):9,800 × 2,800 × 3,200 mm

Condition: new, functionality: fully functional, power: 450 kW (611.83 HP), Year of construction: 2025, ### Crawler Mobile Crusher / Track-Mounted Mobile Stone Crusher: Introduction and Application Introduction: Crawler mobile crushers, also known as track-mounted mobile crushers, are versatile and highly efficient machines designed for crushing various materials on-site. Unlike traditional fixed crushers, these mobile units are mounted on tracks, allowing them to navigate rough terrains and remote locations with ease. These crushers integrate feeding, crushing, screening, and conveying processes into one system, providing flexibility and reducing the need for multiple pieces of equipment. Powered by diesel engines, they offer mobility, reduced setup time, and a compact design that simplifies transportation. Key Features: 1. Mobility: Track-mounted design ensures ease of movement across different sites. 2. Versatility: Suitable for crushing various types of materials, including rocks, ores, and demolition waste. 3. Efficiency: High-performance crushing and screening capabilities. 4. Eco-friendly: Equipped with dust suppression and noise reduction systems. 5. Automation: Advanced control systems for smooth operation and minimal manual intervention. Applications: 1. Quarrying and Mining: Ideal for crushing hard and abrasive stones such as granite, basalt, and limestone. They efficiently process raw materials for construction aggregates and mining operations. 2. Construction and Demolition: Perfect for on-site crushing of demolition waste, including concrete, bricks, and asphalt. This reduces the volume of waste and allows for recycling of materials, contributing to sustainable construction practices. 3. Infrastructure Projects: Widely used in road construction, railway ballast production, and infrastructure development. Their mobility ensures they can operate close to the construction site, reducing material transportation costs. 4. Recycling: Effective in recycling operations, particularly for crushing and processing concrete and asphalt debris. This contributes to reducing landfill use and conserving natural resources. 5. Aggregate Production: Essential for producing high-quality aggregates used in construction projects. Their capability to produce different sizes of aggregates meets various industry standards and requirements. Conclusion: Blsdoq Nfvuepfx Afmjk Crawler mobile crushers are indispensable in modern construction and mining operations. Their mobility, efficiency, and versatility make them a valuable asset for industries requiring on-site crushing and screening. By reducing setup time and transportation costs, they enhance operational efficiency and contribute to eco-friendly practices through material recycling.

Condition: used, functionality: unexamined, Year of construction: 2024, 2024 Tajfun GAP 110 trailer with 2024 DOT 50K crane 11 tonne trailer 7.18m crane max reach Bsdpfx Aoznmixjfmslk

Condition: excellent (used), power: 115 kW (156.36 HP), fuel type: diesel, color: orange, first registration: 07/2013, Year of construction: 2012, operating hours: 15,109 h, General information Model year: 2012 Serial number: DCH210R5NCEAH2500 Bljdpfx Afsy En Ndjmsk Technical information Number of cylinders: 4 Empty weight: 22.600 kg Functional Working width: 300 cm CE mark: yes Condition Technical condition: very good Visual appearance: very good Financial information Price: On request Warranty Warranty: From first owner, with full maintenance records, ready to work! - 80% undercarriage - 3 buckets included: 1300mm, 450mm, and 2000mm cleaning bucket - Optionally with 2021 TOPCON 3D SYSTEM

Condition: used, mileage: 779,055 km, power: 191 kW (259.69 HP), first registration: 11/1998, fuel type: diesel, tire size: 295/80R22,5, axle configuration: 6x2, wheelbase: 4,320 mm, fuel: diesel, color: white, driver cabin: day cab, gearing type: mechanical, number of gears: 8, emission class: euro2, suspension: steel-air, total length: 9,800 mm, total width: 2,550 mm, total height: 3,500 mm, loading space length: 6,700 mm, loading space width: 2,510 mm, loading space height: 830 mm, Year of construction: 1998, Equipment: ABS, crane, trailer coupling, = Additional options and accessories = - Tachograph (driver's control unit) - Fixed - Halogen lamp - Short cab - Manual - Auxiliary drive - Pump - Seat cover - Central lubrication system = Notes = Number of axles: 3, Configuration: 6x2, Tare weight: 8025 kg, Gross vehicle weight: 24000 kg, Total tank capacity: 300 liters, Trailer coupling, Fifth wheel coupling: Fixed, Number of differentials: 1, Central lubrication system, Suspension type: Full air, Type of cab: Short cab, Tachograph (driver's control unit), Color: White, Lighting type: Halogen lamp, Flashing lights, Engine power: 191 kW (256 Hp), Fuel: Diesel, Euro: 2, Transmission type: Manual, Transmission type: Scania, Gears: 8, Clutch pedal, Power steering, ABS, Auxiliary drive, PTO type: 1, Starter battery, Pump, Seat configuration: 1+1, Seat cover: Seat cover, Seat adjustment: Manual, Crane, Crane manufacturer: Hiab 140, Crane year of manufacture: 1998, Crane lifting capacity: 14000, Number of support columns: 2, CE certified, Control position: Side control left and right, Crane position: behind the cab, Hydraulic extension: 2, Hydraulic auxiliary connection: none, Load hook, Spare wheel, Tread depth of spare wheel: 3% = Additional information = Transmission Transmission: SCA, 8 gears, Manual transmission Axle configuration Tire size: 295/80R22.5 Brakes: Drum brakes Axle 1: Tire tread depth left: 3 mm; Tire tread depth right: 3 mm; Suspension: Leaf suspension Axle 2: Dual tires; Tire tread depth left inner: 4 mm; Tire tread depth left outer: 5 mm; Tire tread depth right inner: 6 mm; Tire tread depth right outer: 6 mm; Suspension: Air suspension Axle 3: Tire tread depth left: 5 mm; Tire tread depth right: 6 mm; Suspension: Air suspension Weights Tare weight: 8,025 kg Payload: 15,975 kg GVW: 24,000 kg Functional Crane: Hiab 140, year of manufacture 1998, behind the cab Pump: Yes Condition Overall condition: average Technical condition: average Optical condition: average Damage: none Number of keys: 2 Identification License plate: KLEYN1 = Company information = Bljdpfszqn Insx Afmjk Kleyn Trucks is one of the largest independent used vehicle dealerships in the world. Here you can choose from a constantly changing stock of 1200 used trucks, tractor units, and trailers. Our range includes all European brands from various years of manufacture and price ranges. Why buy from Kleyn Trucks? Simple! • Large, rapidly changing stock • Recognizable quality • A good price • Proper business practices • We speak many languages • We understand our customers • Support for import and transport • (Export) registration is quickly arranged • Expert technical services • The security of "recognizable quality" • And more.... Please visit our website for special offers and a complete inventory: Leasing via Kleyn Trucks is possible in most European countries! Quickly calculate your leasing rate and submit an inquiry via our website. Ask directly about our European warranty package.

Condition: good (used), Winch rope, crane rope, hoist rope, wire rope -Wire rope: Ø 10 mm -Length: 9.5 m -for electric cable winch Bodpfsghnbwsx Afmslk -other crane ropes are also available -Number: 7x rolls of crane ropes available -Price: per roll -Weight: 4 kg/piece

Condition: excellent (used), Winch rope, crane rope, lifting rope, wire rope, stainless steel rope, forestry winch rope, round strand rope -Manufacturer: TECI, crane rope, round strand rope Ø 9 mm -Rope type: 7x19 -Length: 58 m -Quantity: 1x wire rope available -Price: per piece -other crane ropes also available Bsdpfx Afjv E H Sromjlk -Transport dimensions: Ø 300 x 220 mm / Ø 400 x 300 mm -Weight: 22 kg

Condition: excellent (used), mileage: 574,897 km, power: 338 kW (459.55 HP), first registration: 04/2012, fuel type: diesel, axle configuration: 8x4, fuel: diesel, brakes: retarder, color: black, driver cabin: sleeper cab, gearing type: automatic, emission class: euro5, loading space length: 5,300 mm, loading space width: 2,480 mm, loading space height: 400 mm, Year of construction: 2012, Equipment: ABS, air conditioning, central locking, crane, cruise control, electric window regulation, retarder, trailer coupling, = Additional options and accessories = - Electrically operated rear windows - Engine Brake - Gullet - PTO - Radio/CD player - Refridgerator - Rotator - Sleeping cabin - Steering Axle - Sun visor - Toolbox = Remarks = Blsdpfxezacqds Afmsk Crane Number of hydraulic extensions: 6 Number of support legs: 4 Remote control: ✓ Load Hook: ✓ Rotator: ✓ Meter capacity: 3 m Capacity kilo: 8999 kg = More information = General information Cab: single Registration number: 1DBJ633 Axle configuration Front axle 1: Steering Front axle 2: Double wheels Rear axle 1: Double wheels Rear axle 2: Steering Weights Empty weight: 18.950 kg Carrying capacity: 13.050 kg GVW: 32.000 kg Functional Crane: HIAB 322E-6 HI DUO, year of manufacture 2012, on rear of chassis Layout Number of beds: 1 Condition Technical condition: very good Visual appearance: very good = Dealer information = Do you have any questions or suggestions? Please feel free to contact us. We guarantee a response within 8 hours. Prices do not include VAT. No rights may be derived from the information provided. Office phone number: Mobile: Dutch - English - German - French - Spanish - Italian) Available via WhatsApp and Viber. Mobile: Available via WhatsApp and Viber. When paying by bank transfer, the funds must be transferred to our bank account listed below. Always verify the payment details on our website. Please contact us if you have received different information. If in doubt, please call us so we can verify the invoice and/or payment. Bank details: Bank name: ING Bank address: Bijlmerdreef 106 1102 CT Amsterdam IBAN number: NL97INGB0117176699 EORI/VAT/TAX: NL810574901B(01) BIC/SWIFT: INGBNL2A

Condition: good (used), lifting height: 16,400 mm, Year of construction: 2018, operating hours: 406 h, Empty weight: 2.800 kg Make of engine: Yanmar Lifting capacity: 3.150 kg Bedpfxex Hv Rrs Afmolk CE mark: yes Technical condition: good Visual appearance: good Maximum lifting capacity at end of jib: 250 kg Delivery terms: EXW Please contact Vink Machinery for more information Hoeflon C6 * 2018 * 406 working hours * Diesel (Yanmar) and 230-volt drive * Fully equipped * 16.4-meter working height * 14.4-meter horizontal reach * 3150 kg lifting capacity * 2800 kg net weight * Remote control * Articulated outriggers * Documents included

Condition: used, total height: 1,200 mm, total length: 16,640 mm, total width: 3,510 mm, Colour: Yellow Empty weight: 3.000 kg Price: On request - Documentation available: No - CE certificate present: No - Serial number: 13/6 KF2 - Lifting capacity [kg]: 3000 - Span [mm]: 16600 - Girder: Single - Crane control: Fixed cable - Dismantled: Yes - Transport dimensions: 16640mm x 3515mm x 1200mm (l x w x h) Bedpfx Ajzn H N Ssfmjlk - Transport weight [kg]: 3000kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum