US PATENT SUBCLASS 400 / 690.1
.~.~.~ With viewing window (e.g., having reflection eliminator)

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

679  DF  MEANS AUXILIARY TO TYPEWRITING FUNCTION {12}
689  DF  .~ Means for muffling typewriter noise {1}
690  DF  .~.~ By sound-barrier enclosure for typewriter (e.g., by sound-absorbing material) {3}
690.1.~.~.~ With viewing window (e.g., having reflection eliminator) {1}
690.2  DF  .~.~.~.~> And externally protruding (e.g., key-board, etc.) operating means

DEFINITION

Classification: 400/690.1

With viewing window (e.g., having reflection eliminator):

(under subclass 690) Subject matter wherein the surrounding means has a transparent section therein so that the typist may see any part of the typewriter or the record-medium.

(1) Note. In some typewriters the transparent section is

arranged to prevent or reduce the possibility of the typist seeing a false or unwanted image.