US PATENT SUBCLASS 355 / 31
.~ Copying sound record

Current as of: June, 1999
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355 /   HD   PHOTOCOPYING

18  DF  PROJECTION PRINTING AND COPYING CAMERAS {27}
31.~ Copying sound record

DEFINITION

Classification: 355/31

(under subclass 18) Subject matter wherein the copying device is especially adapted to copy a sound record which is on an original document or film onto photosensitive material.

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98, for contract printing machines with sound track printing means.

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369, Dynamic Information Storage or Retrieval,

84+, for dynamic duplication of a sound track.