US PATENT SUBCLASS 434 / 405
.~ Plaque slidable relative to index (e.g., window in card, etc.) to selectively align different points on plaque therewith

Current as of: June, 1999
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434 /   HD   EDUCATION AND DEMONSTRATION

365  DF  MEANS FOR DEMONSTRATING APPARATUS, PRODUCT, OR SURFACE CONFIGURATION, OR FOR DISPLAYING EDUCATION MATERIAL OR STUDENT'S WORK {37}
405.~ Plaque slidable relative to index (e.g., window in card, etc.) to selectively align different points on plaque therewith

DEFINITION

Classification: 434/405

Plaque slidable relative to index (e.g.., window in card, etc.) to selectively align different points on plaque therewith:

(under subclass 365) Subject matter including a stiff board or sheet translatable relative to a pointer, an aperture in a second stiff sheet or board, or some other indexing means so that various points on the first mentioned sheet or board can be brought into register with said pointer, said aperture in said second sheet or board, or other indexing means as desired.

SEE OR SEARCH THIS CLASS, SUBCLASS:

199, for similar devices used for teaching mathematics.