US PATENT SUBCLASS 400 / 493.2
.~.~.~.~ With slot for exchanging disc

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  DF  .~.~ Including character-bearing disc on key cap {1}
493.1  DF  .~.~.~ Secured by encircling ring member {1}
493.2.~.~.~.~ With slot for exchanging disc

DEFINITION

Classification: 400/493.2

With slot for exchanging disc:

(under subclass 493.1) Subject matter wherein said element is provided with an elongated hole therein, through which hole the component may be removed from the key* cap and through which hole the same or another component may be inserted onto the key cap.