US PATENT SUBCLASS 361 / 182
.~.~.~ Frequency (e.g., audio, radio)

Current as of: June, 1999
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361 /   HD   ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES

139  DF  CONTROL CIRCUITS FOR ELECTROMAGNETIC DEVICES {7}
160  DF  .~ For relays or solenoids {11}
170  DF  .~.~ Condition responsive (e.g., external circuit condition) {9}
182.~.~.~ Frequency (e.g., audio, radio) {2}
183  DF  .~.~.~.~> Plural relays or solenoids as loads
184  DF  .~.~.~.~> Specific frequency responsive relay

DEFINITION

Classification: 361/182

Frequency (e.g., audio, radio):

(under subclass 170) Subject matter wherein circuits or devices which respond to audio or radio frequencies are used to initiate the operation of the relay or solenoid.

SEE OR SEARCH CLASS

178, Telegraphy,

47+, for this subject matter in telegraph systems.

340, Communications: Electrical,

825+, for this subject matter in miscellaneous communication systems.