US PATENT SUBCLASS 361 / 147
.~.~ With permanent magnet

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

139  DF  CONTROL CIRCUITS FOR ELECTROMAGNETIC DEVICES {7}
143  DF  .~ Systems for magnetizing, demagnetizing, or controlling the magnetic field {5}
147.~.~ With permanent magnet {1}
148  DF  .~.~.~> Calibration or permanent magnet

DEFINITION

Classification: 361/147

With permanent magnet:

(under subclass 143) Subject matter wherein a permanent magnet is combined with the electromagnet.