US PATENT SUBCLASS 400 / 491.2
.~.~.~ Including spring supporting key cap or key stem

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

472  DF  KEY-BOARD OR KEY LEVER-ACTUATING MECHANISM {12}
490  DF  .~ Key-cap or key-stem structure {5}
491  DF  .~.~ Including cushioning means (e.g., yieldable surface) {2}
491.2.~.~.~ Including spring supporting key cap or key stem {1}
491.3  DF  .~.~.~.~> With sensory indicator (e.g., sound, tactile response, etc.)

DEFINITION

Classification: 400/491.2

Including spring supporting key cap or key stem:

(under subclass 491) Subject matter wherein said means includes a resilient or yieldable component that connects said key* cap to said key stem or that connects said key stem to the key lever and holds the parts of the key element in place.