US PATENT SUBCLASS 361 / 188
.~.~.~ Variable impedance

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}
188.~.~.~ Variable impedance

DEFINITION

Classification: 361/188

Variable impedance:

(under subclass 170) Subject matter wherein the initiating circuit or device is responsive to variable impedance values.