| http://www.w3.org/ns/prov#value | - In a device of the character described, a support, a contact carrier comprisin a flat bridge piece pivotally mounted in said sup port on one of its side edges, a rocker pivotally mounted in said support, operating means connecting therocker and carrier including a spring, and inclined cams carried by the rocker on opposite sides of the' contact carrier arranged to engage the free edge of the carri
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