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.