US PATENT SUBCLASS 400 / 693
.~.~ Housing structure

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

679  DF  MEANS AUXILIARY TO TYPEWRITING FUNCTION {12}
691  DF  .~ Frame, casing, or support for typewriter {3}
693.~.~ Housing structure {1}
693.1  DF  .~.~.~> For ink-ribbon spool (e.g., spool cover, etc.)

DEFINITION

Classification: 400/693

Housing structure:

(under subclass 691) Subject matter wherein significance is attributed to that part of the structure which encloses or surrounds the typewriter or a portion thereof.