US PATENT SUBCLASS 400 / 688
.~ Means for increasing typewriter noise

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

679  DF  MEANS AUXILIARY TO TYPEWRITING FUNCTION {12}
688.~ Means for increasing typewriter noise

DEFINITION

Classification: 400/688

Means for increasing typewriter noise:

(under subclass 679) Subject matter wherein significance is attributed to amplification of or addition to the sounds produced by a typewriter during normal use thereof.