US PATENT SUBCLASS 400 / 661.1
.~.~.~ Including plural layers of varying hardness

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  DF  .~.~ With sound-muffling means {4}
661.1.~.~.~ Including plural layers of varying hardness

DEFINITION

Classification: 400/661.1

Including plural layers of varying hardness:

(under subclass 661) Subject matter wherein the platen* is formed of a plurality of thicknesses of material substantially concentrically arranged, and wherein the outermost thickness of material is of a different firmness than the innermost thickness.

SEE OR SEARCH THIS CLASS, SUBCLASS:

662, for a platen having surface portions of varying hardness.