| http://www.w3.org/ns/prov#value | - The device of claim 1 or 3 constructed so that said movement of said armature is produced by a torque resulting from the interaction of said magnetic field and the current in said loop, said torque being of the form T=KBIa where B is the field strength of said permanent magnet, K is a constant, and Ia is the current induced in said loop, and wherein the motion of said armature causes a damping tor
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