US PATENT SUBCLASS 361 / 180
.~.~.~.~ Metal presence or absence responsive

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}
179  DF  .~.~.~ Proximity or contact {2}
180.~.~.~.~ Metal presence or absence responsive

DEFINITION

Classification: 361/180

Metal presence or absence responsive:

(under subclass 179) Subject matter wherein the initiating device or circuit responds to the presence or absence of metal in proximity to or contact with the device.