| http://www.w3.org/ns/prov#value | - The combination, with ai'rame and arbor constituting the fixed portion ot' the inachine, of a spring-drum mounted on said arbor, cords or chains wound upon said drum and passing to the lamp or other article to be suspended, a plate surrounding the arbor and in contact with the drum, said plate and fixed portion being provided, the one with a wedge or cam and the other with a projection acting in c
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