US PATENT SUBCLASS 400 / 493.1
.~.~.~ Secured by encircling ring member

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.~.~.~ Secured by encircling ring member {1}
493.2  DF  .~.~.~.~> With slot for exchanging disc

DEFINITION

Classification: 400/493.1

Secured by encircling ring member:

(under subclass 493) Subject matter wherein said component is mounted on said key* cap and fastened thereto by an annular element that surrounds the component and the key cap.