| http://www.w3.org/ns/prov#value | - The article of claim 1 in which the switch for controlling the flow of current to the transmitter is a plunger-type switch carried by the tubular housing, the plunger-type switch being in an off condition'at its two extremes of movement and being brought into an on condition when the plunger is moved past a point intermediate these extremes of movement. 3.
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