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2. Jack (device) - Wikipedia

   en.wikipedia.org/wiki/Jack_(device)

   A 2.5-ton house jack that stands 24 inches from top to bottom fully threaded out. A house jack, also called a screw jack, is a mechanical device primarily used to lift buildings from their foundations for repairs or relocation. A series of jacks is used and then wood cribbing temporarily supports the structure. This process is repeated until ...

3. Jackscrew - Wikipedia

   en.wikipedia.org/wiki/Jackscrew

   A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderate and heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses.

4. See How Your Favorite Jack Stands Compare In This Head-to ...

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   The $80 Big Red tube-style jack stands also performed well thanks to their unique design and wide base. At $81 the Hein-Werner jack stands performed below expectations, beaten out by cheaper ...

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6. Crane (machine) - Wikipedia

   en.wikipedia.org/wiki/Crane_(machine)

   This meant that, in comparison to the construction of the ancient Egyptian pyramids, where about 50 men were needed to move a 2.5 ton [which?] stone block up the ramp (50 kg (110 lb) per person), the lifting capability of the Roman polyspastos proved to be 60 times higher (3,000 kg or 6,600 lb per person). [10]

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