| http://www.w3.org/ns/prov#value | - standard tumbler switch lever and each opening have associated with it a pair of openings for standard tixture securing screws, a plurality of interchangeable electrical devices at the back of the plate having parts fitting thel said openings and at least one of which is other than a switch, and supporting elements for said devices having screw threaded openings to receive securing screws in the
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