US PATENT SUBCLASS 178 / FOR 102
.~.~ Variable direct current (178/20)

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

2.0R  DD  SYSTEMS {2}
FOR 100  DF  .~ Writing (178/18) {2}
FOR 102.~.~ Variable direct current (178/20)

DEFINITION

Classification: 178/FOR.102

Foreign art collections for writing systems employing a direct current varied by the motions of the stylus in writing.