Summarizing Sequential Data with Closed Partial Orders

A jack for supporting a standing vehicle that is composed of a hydraulic cylinder swingable on a horizontal pivot between an up and retracted position and a vertical down position. Positioned alongside the cylinder is a link mounted on a horizontal pivot offset fore-and-aft and beneath the pivot carrying the cylinder. The lower end of the link carries a lock that engages the ram when it is retracted and engages and locks the cylinder when it moves to its vertical position. Due to the lock and the relative position of the pivots, the cylinder is forced to swing downwardly as it starts its extension stroke and is locked in vertical position after initial extension of the ram.

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