US PATENT SUBCLASS 400 / 509
.~.~ Including a flat roll or core therefor

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

497  DF  WITH CONTROL OF "CARBON PAPER" FOR TYPING PLURAL SIMULTANEOUS COPIES BY SINGLE IMPRESSION (E.G., ON "MANIFOLD SET") {10}
508  DF  .~ Including spool or support for roll of carbon paper {4}
509.~.~ Including a flat roll or core therefor

DEFINITION

Classification: 400/509

Including a flat roll or core therefor:

(under subclass 508) Subject matter wherein significance is attributed to the configuration of the coiled convolutions being compressed in a first diametral dimension and expanded in a second diametral dimension at right angles to the first dimension, or wherein significance is attributed to a reel on which a coil of said configuration has been wound.