US PATENT SUBCLASS 400 / 493
.~.~ Including character-bearing disc on key cap

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}
493.~.~ Including character-bearing disc on key cap {1}
493.1  DF  .~.~.~> Secured by encircling ring member {1}

DEFINITION

Classification: 400/493

Including character-bearing disc on key cap:

(under subclass 490) Subject matter wherein said key* cap is provided with a thin, flat, circular component mounted on the

top surface of the key cap, which component bears on its top surface an indicium representing the character* symbol that will be imprinted on the record-medium* when the key element bearing said key cap is pressed.