US PATENT SUBCLASS 178 / 106
.~ Shifting contact point

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

101  DF  KEYS {9}
106.~ Shifting contact point

DEFINITION

Classification: 178/106

(under subclass 101) Telegraph keys having one or more of the contacts movable or revoluble, so that the points of contact may be renewed when they are roughened or burned by heavy currents or use.