US PATENT SUBCLASS 400 / 206
.~.~ Using plural ribbons (e.g., additional ribbon(s)

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

191  DF  INCLUDING INTERPOSED INKING DEVICE (E.G., RIBBON) FOR RECORD-MEDIUM {15}
204  DF  .~ For typing plural copies simultaneously with ribbon(s) (e.g., duplicate typing) {2}
206.~.~ Using plural ribbons (e.g., additional ribbon(s) {4}
206.1  DF  .~.~.~> Including "carbon paper" ribbon
206.2  DF  .~.~.~> And ribbon holder movable to inoperative position on typewriter
206.3  DF  .~.~.~> On plural coaxial spools
206.4  DF  .~.~.~> On single spool

DEFINITION

Classification: 400/206

Using plural ribbon(s) [e.g., additional ribbon(s)]:

(under subclass 204) Subject matter wherein the imprinting of identical character* symbols on the record-medium* pieces is accomplished by the concurrent use of more than one ribbon.