(under subclass 160) Subject matter in which the means producing an electric speed signal is responsive to the supply voltage or current of an electric motor.
SEE OR SEARCH CLASS
318, Electricity: Motive Power Systems, and
490, for electric motors with signals, meters, recorders or testing devices.
388, Electricity: Motor Control Systems, appropriate subclasses, together with art collection 928.1, for running-speed and acceleration control systems for responsive to terminal electromotive force.
