Wikipedia:Featured pictures/Engineering and technology/Machinery

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  Continental XI-1430, by Dane A. Penland
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  Crankset, by Petar Milošević
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  Turbines of the Walchensee Hydroelectric Power Station, by Poco a poco
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  Hyperglide, by Petar Milošević
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  Backside of a automatic watch, by Petar Milošević
• Rotation of the Falkirk Wheel, by Diliff
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  Bagger 288, by Raymond
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  Windmills, by Uberprutser
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  M-209, by Rama
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  ULPower UL260i, by ULPower Aero Engines
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  Pinball, by Kevin Tiell
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  Barrow Offshore Wind Farm, by Andy Dingley (edited by Muhammad Mahdi Karim)
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  Thorntonbank Wind Farm, by Lycaon (edited by Mfield)
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  Wire brushes, by JJ Harrison
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  Firebox, by Raul654
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  Submarine design at Nautilus (1800 submarine), by Robert Fulton (edited by Durova)
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  Welder, by Alfred T. Palmer (edited by Durova)
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  Steam turbine, by Siemens
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  Turbojet, by Jeff Dahl
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  Nesjavellir Geothermal Power Station, by Gretar Ivarsson
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  Movable type, by Willi Heidelbach
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  Coal thermal power station, by BillC (edited by MaCRoEco)
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  Falkirk Wheel, by Sean McClean
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  Gas metal arc welding, by William M. Plate Jr.
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  Enigma rotor details, by Wapcaplet
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  Start of the four-stroke cycle at Four-stroke engine, by Wapcaplet
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  Epicyclic gear ratios at Epicyclic gearing, by Wapcaplet

Animations

Tablet press, by Jeff Dahl

Fuel injector, by WikipedianProlific

Radial engine at Firing order, by Duk

Geneva drive, by Mike1024