US PATENT SUBCLASS 361 / 184
.~.~.~.~ Specific frequency responsive relay

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  DF  .~.~.~ Frequency (e.g., audio, radio) {2}
184.~.~.~.~ Specific frequency responsive relay

DEFINITION

Classification: 361/184

Specific Frequency Responsive Relay:

(under subclass 182) Subject matter which includes a relay which only operates when excited with a supply of a predetermined frequency.