US PATENT SUBCLASS 400 / 189
.~ By simultaneous use of both surfaces of same ribbon

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

188  DF  FOR TYPING ON REVERSE SURFACE OF RECORD-MEDIUM {2}
189.~ By simultaneous use of both surfaces of same ribbon

DEFINITION

Classification: 400/189

By simultaneous use of both surfaces of same ribbon:

(under subclass 188) Subject matter wherein a ribbon* is used as a transfer-medium* for imprinting said character* symbols on said first surface, and wherein the same ribbon is used as a transfer-medium for imprinting corresponding character symbols on another record-medium surface or on a surface of another record-medium at the same time the character symbols are imprinted on the first surface.