US PATENT SUBCLASS 400 / 661
.~.~ With sound-muffling means

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

648  DF  PLATEN OR PLATEN-MOVING MECHANISM {5}
659  DF  .~ Cylindrical platen {3}
661.~.~ With sound-muffling means {4}
661.1  DF  .~.~.~> Including plural layers of varying hardness
661.2  DF  .~.~.~> Including cylinder containing fluent (e.g., fluid, etc.) material
661.3  DF  .~.~.~> Including cylindrical sections or rings (e.g., of character-space width)
661.4  DF  .~.~.~> Including a wound member

DEFINITION

Classification: 400/661

With sound-muffling means:

(under subclass 659) Subject matter wherein significance is attributed to a platen* that is provided with means for eliminating or reducing the noise produced by the impact of a type-member* against the surface of the platen.

SEE OR SEARCH THIS CLASS, SUBCLASS:

689+, for other means for muffling the noise produced by a typewriter.