| http://www.w3.org/ns/prov#value | - As will be described more fully hereinafter, the contact member of dimmer A is mechanically controlled by a knob, such as l4, which is the same member that controls the movement of the brush-arm 40 or switch C, so that there is a definite relationship between the instantaneous voltages produced by dimmer A and the position of the brush-arm 40 during the course of its passage over the segments 42
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