(under subclass 236) Subject matter wherein the electrical circuit includes circuitry in which the frequency of an A.C. current or the frequency of a D.C. pulse is representative of the speed of the member.
SEE OR SEARCH CLASS
322, Electricity: Single Generator Systems,
29+, for generator systems which are responsive to the speed or frequency of the generator.
324, Electricity: Measuring and Testing,
166+, for speed related frequency generators used to measure speed.
