US PATENT SUBCLASS 40 / 491
.~ Sliding plate

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

446  DF  CHANGING EXHIBITOR {25}
491.~ Sliding plate

DEFINITION

Classification: 40/491

Sliding plate:

(under subclass 446) Device provided with sliding charactered plates which may be projected from the back of the board at will so that the characters may be observed either beyond the edges of the board or through an aperture therein.