US PATENT SUBCLASS 400 / 661.2
.~.~.~ Including cylinder containing fluent (e.g., fluid, etc.) material

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}
661.2.~.~.~ Including cylinder containing fluent (e.g., fluid, etc.) material

DEFINITION

Classification: 400/661.2

Including cylinder containing fluent (e.g., fluid, etc.) material:

(under subclass 661) Subject matter wherein the platen* includes a cylindrical tube surrounding a flowable substance.

(1) Note. The material within the cylinder may be, for

example, sand, air, liquid, etc., or any other fluent material that yields under impact.