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Lifting Jack.

Description: Patent for a new and improved jack. This design consists in "the combination, with a standard provided with an elongated open slot and a moveable section adapted to slide within the slot, of an operating-lever pivoted to the standard at the side of the slot, and a link pivotally secured to the sliding section and lever, whereby the lever is thrown past the center and the sliding section thereby locked in an elevated position" (lines 67-75).
Date: July 15, 1884
Creator: Thorp, James L.
Partner: UNT Libraries Government Documents Department