US PATENT SUBCLASS 40 / 439
.~ Fluid operated


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

427  DF  DISPLAY WITH SPECIAL EFFECTS {5}
439.~ Fluid operated {1}
440  DF  .~.~> Rotatable {1}


DEFINITION

Classification: 40/439

Fluid operated:

(under subclass 427) Display device wherein the effect is created by an apparatus operated by pressure of a fluid such as air, gas, steam, or water.

SEE OR SEARCH THIS CLASS, SUBCLASS:

477+, for changing exhibitors operated in a similar manner.

613, for signs which vibrate as a result of fluid or wind pressure.