.~ With magneto-mechanical motive device (e.g., electromagnet with armature) {21}
221
.~.~ Frequency-responsive type
DEFINITION
Classification: 335/221
(under subclass 220) Subject matter wherein the armature is actuated when the electromagnet is excited with a supply signal of a predetermined frequency or range of frequencies.
(1) Note. This subclass includes electromagnets with armature in which the armature is actuated in response to a predetermined change or shift in frequency.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4+, for radio frequency switches such as the T/R type.
70, for frequency responsive or synchronous motor operated switches.
94, for frequency responsive vibratory reed type switches.
101, for alternating current switches responsive to preselected or synchronous frequency. 243, for alternating current actuated electromagnets with armature.
SEE OR SEARCH CLASS
307, Electrical Transmission or Interconnection Systems,
129, for frequency responsive transmission or interconnection electrical switching systems.
318, Electricity:
147, for electrical circuit for frequency responsive relay or electromagnet.
