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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
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Onward to 2016

Shidong Jia1, Antonio Chiesi2, Winston Patrick Kuo1,3

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Journal of Circulating Biomarkers
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No abstract available in PubMed .

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