| http://www.w3.org/ns/prov#value | - The coil springs 123 may extend the length of the exposed guide rods 122 when the guide rods are inserted into the slots 55 or, alternatively, proximal ends of the coil springs may be immobilized on the guide rods by such means as welding or by including perpendicularly extending protuberances on the guide rods which limit vertical movement of the coil springs.
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