US PATENT SUBCLASS 400 / 487
.~.~ Color-coded key-board

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

472  DF  KEY-BOARD OR KEY LEVER-ACTUATING MECHANISM {12}
486  DF  .~ Key-board arranged according to character location {1}
487.~.~ Color-coded key-board

DEFINITION

Classification: 400/487

Color-coded key-board:

(under subclass 486) Subject matter wherein significance is attributed to the color or tint of the key* elements that are positioned on the key-board*, the elements being grouped in accordance with color.