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| Jack (device) ： ウィキペディア英語版 |
Jack (device)
A jack is a mechanical device used as a lifting device to lift heavy loads or to apply great forces. A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be performed. Jacks are usually rated for a maximum lifting capacity (for example, 1.5 tons or 3 tons). Industrial jacks can be rated for many tons of load.
==Jackscrew==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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