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Class Information
Number: 434/199
Name: Education and demonstration > Mathematics > Arithmetic > Plaque slidable relative to index (e.g., window in card, etc.) to selectively align different points on plaque therewith
Description: 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.

Patents under this class:

Patent Number Title Of Patent Date Issued
8317522 Hormonal quotient profile calculator Nov. 27, 2012
8267691 Threat fire simulation and training system Sep. 18, 2012
6716033 System for teaching mathematics Apr. 6, 2004
6079983 Educational instrument for numbers Jun. 27, 2000
5820382 Multifilication quizzer Oct. 13, 1998
5518409 Sliding digital bookmarker May. 21, 1996
5407356 Pictorial image transforming manipulative-with multiple channel tracks Apr. 18, 1995
5277587 Learning toy Jan. 11, 1994
4915634 Visual and manipulative teaching aid for mathematics Apr. 10, 1990
4856998 Teaching aids Aug. 15, 1989
4372742 Arithmetical teaching aid Feb. 8, 1983
4241522 Teaching aid Dec. 30, 1980
4185401 Arithmetic game board Jan. 29, 1980

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