| http://www.w3.org/ns/prov#value | - , pistons sliding in said casings, a series of springs acting in parallel with said casings and interposed between said casings and a connecting ring loaded by the springs and by the pistons, such that, when the control cylinder is put under pressure, the fluid pressure acts on the auxiliary pistons and moves the connecting ring in such a manner as to stress said springs, thereby preventing the pr
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