US PATENT SUBCLASS 347 / 169
.~.~.~ Helix drum

Current as of: June, 1999
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347 /   HD   INCREMENTAL PRINTING OF SYMBOLIC INFORMATION

111  DF  ELECTRIC MARKING APPARATUS OR PROCESSES {3}
163  DF  .~ By electrochemical {3}
166  DF  .~.~ Specific head {3}
169.~.~.~ Helix drum

DEFINITION

Classification: 347/169

Helix drum:

(under subclass 166) Subject matter wherein a raised conductor on a rotatable drum in the form of a spiral is used as a backing electrode to effect scanning of the recording medium when the drum is rotated.