US PATENT SUBCLASS 400 / 689
.~ Means for muffling typewriter noise

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

679  DF  MEANS AUXILIARY TO TYPEWRITING FUNCTION {12}
689.~ Means for muffling typewriter noise {1}
690  DF  .~.~> By sound-barrier enclosure for typewriter (e.g., by sound-absorbing material) {3}

DEFINITION

Classification: 400/689

Means for muffling typewriter noise:

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

SEE OR SEARCH THIS CLASS, SUBCLASS:

661, for a platen* having means for muffling noise produced by a typewriter.