US PATENT SUBCLASS 307 / 137
.~.~ Switch contact conditioning

Current as of: June, 1999
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307 /   HD   ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS

112  DF  SWITCHING SYSTEMS {5}
134  DF  .~ With operation facilitating feature {2}
137.~.~ Switch contact conditioning {1}
138  DF  .~.~.~> Polarity reversing

DEFINITION

Classification: 307/137

(under subclass 134) Subject matter having means for conditioning switch contacts.

(1) Note. This subclass relates, for example, to systems having means for vibrating the switch contacts, so that they are always in a polished condition, because of the mechanical wear on the contacts.