US PATENT SUBCLASS 400 / 491.3
.~.~.~.~ With sensory indicator (e.g., sound, tactile response, etc.)

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  DF  .~.~.~ Including spring supporting key cap or key stem {1}
491.3.~.~.~.~ With sensory indicator (e.g., sound, tactile response, etc.)

DEFINITION

Classification: 400/491.3

With sensory indicator (e.g., sound, tactile response, etc.):

(under subclass 491.2) Subject matter wherein said means also includes a member that stimulates one of the senses of the typist to enhance the awareness of the typist to the act of typing.

(1) Note. Included in this subclass is a device to produce an audible "click" when the key* element is pressed, or indicate to the sense of touch a slight, temporary pause in the movement of the key lever.