US PATENT SUBCLASS 40 / 519
.~.~ Cluth take-up


Current as of: June, 1999
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40 /   HD   CARD, PICTURE, OR SIGN EXHIBITING

446  DF  CHANGING EXHIBITOR {25}
518  DF  .~ Double reel and web {3}
519.~.~ Cluth take-up


DEFINITION

Classification: 40/519

Clutch take-up:

(under subclass 518) Device including means for rotating the roller in a step-by-step motion to expose the items which means includes (1) a first means for applying torque to the roller to rotate the roller about its axis, and (2) a second means to then prevent further rotation of the roller until such time as the first means is again actuated.