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.