US PATENT SUBCLASS 400 / 491.1
.~.~.~ Including underlying air cushion

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}
491.1.~.~.~ Including underlying air cushion

DEFINITION

Classification: 400/491.1

Including underlying air-cushion:

(under subclass 491) Subject matter wherein said means includes a resilient bag or container having a gas therein.