US PATENT SUBCLASS 226 / 156
.~.~ Unidirectional

Current as of: June, 1999
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226 /   HD   ADVANCING MATERIAL OF INDETERMINATE LENGTH

120  DF  BY INTERMITTENT (INTERRUPTED) MATERIAL-MOVER {13}
152  DF  .~ Comprising material-moving roll {3}
156.~.~ Unidirectional {1}
157  DF  .~.~.~> Ratcheted roll

DEFINITION

Classification: 226/156

(under subclass 152) Device wherein the roll* is incapable of turning in a reverse direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

148, for a unidirectional roll comprising a retrograde motion preventer.