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Class Information
Number: 434/198
Name: Education and demonstration > Mathematics > Arithmetic > Plaque (e.g., disk, etc.) turnable 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 pivotal 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
7491061 Educational math toy Feb. 17, 2009
5863205 Learning clock featuring coordinated color clock face numbers, hour and minute hands, and hour and minute hand learning displays Jan. 26, 1999
5823783 Rotating pie graph: mathematics learning tool Oct. 20, 1998
5057067 Method of making a paper spinning wheel product Oct. 15, 1991
4920033 Rotatable disk teaching apparatus Apr. 24, 1990
4714429 Arithmetic educational device Dec. 22, 1987
4634385 Teaching wheels Jan. 6, 1987
4633070 Informational device adapted to convert binary to decimal numerals Dec. 30, 1986
4568086 Educational random problem selector Feb. 4, 1986
4508344 Spinner device Apr. 2, 1985
4445867 Educational board game May. 1, 1984
4360347 Mathematical educational game devices Nov. 23, 1982
4313727 Educational frame device having a rotatable body and rotatable symbol-bearing inserts Feb. 2, 1982
4269597 Finger arithmetic device May. 26, 1981
4043057 Teaching aid Aug. 23, 1977
4021940 Educational device May. 10, 1977

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