US PATENT SUBCLASS 178 / 37
.~.~.~ Privacy (e.g., mechanical packaging or covering of printed message)

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

2 R  DF  SYSTEMS {21}
23 R  DF  .~ Printing {8}
36  DF  .~.~ Recorders {3}
37.~.~.~ Privacy (e.g., mechanical packaging or covering of printed message)

DEFINITION

Classification: 178/37

(under subclass 36) Recorders for concealing or secreting the printed message from those not authorized to read it.

SEE OR SEARCH CLASS

380, Cryptography, appropriate subclasses for cryptos:graphic techniques and equipment.