(under subclass 157) Subject matter wherein means responsive to a predetermined condition acts upon the system to provide a control to maintain or vary the output frequency of the system in response to that condition.
SEE OR SEARCH THIS CLASS, SUBCLASS:
164, for frequency conversion with automatic voltage magnitude control.
SEE OR SEARCH CLASS
322, Electricity: Single Generator Systems,
17+, for miscellaneous generator systems having automatic control of generator or driving means, which control may be control of the output frequency.
331, Oscillators, 1+, for oscillation generation systems with automatic frequency stabilization.
