US PATENT SUBCLASS 40 / 521
.~.~.~ With clutch


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}
520  DF  .~.~ Spring rewind {1}
521.~.~.~ With clutch


DEFINITION

Classification: 40/521

With clutch:

(under subclass 520) Device including pawl and ratchet means cooperating with said spring means to wind or unwind said rollers.

SEE OR SEARCH CLASS

74, Machine Element or Mechanism,

118+, for intermittent grip, mechanical movement for ratchet and pawl actuation to a rotary output.