US PATENT SUBCLASS 434 / 199 .~.~ 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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.~.~ Plaque slidable relative to index (e.g., window in card, etc.) to selectively align different points on plaque therewith
DEFINITION
Classification: 434/199
Plaque slidable relative to index (e.g.., window in card, etc.) to selectively align different points on plaque therewith:
(under subclass 191) Subject matter including a first stiff sheet or board translatable relative to a pointer, an aperture in a second stiff sheet or board, or other indexing means so that various points on the first sheet or board can be brought into register with said pointer, aperture in said second sheet or board, or other indexing means as desired.
SEE OR SEARCH THIS CLASS, SUBCLASS:
405, for similar devices not used for teaching mathematics.
