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Class Information
Number: 434/202
Name: Education and demonstration > Mathematics > Arithmetic > Keyboard or like manually manipulated array (e.g., slides, levers, etc.)
Description: Subject matter including an assemblage of systematically arranged keys, slidable or turntable members, or the like by means of which a machine is caused to function.

Patents under this class:

Patent Number Title Of Patent Date Issued
6938897 Universal role playing game elevation indicator system Sep. 6, 2005
6884077 Apparatus for math calculation and instruction Apr. 26, 2005
6712614 Abacus calculator Mar. 30, 2004
6079983 Educational instrument for numbers Jun. 27, 2000
5425643 Mechanical, analog type, teaching aid computer Jun. 20, 1995
4959017 Electronic learning device for teaching how to handle money Sep. 25, 1990
4836786 Demonstration calculator Jun. 6, 1989
4753439 Message type recording psychographs Jun. 28, 1988
4725237 Children's educational apparatus Feb. 16, 1988
4674433 Correct answer displaying device for arithmetic practicing unit Jun. 23, 1987
4611996 Teaching machine Sep. 16, 1986
4525148 Multi-modal educational and entertainment system Jun. 25, 1985
4447213 Electronic learning aid May. 8, 1984
4358273 Electronic self-study device Nov. 9, 1982
4340374 Electronic learning aid Jul. 20, 1982
4258477 Multiplication study device Mar. 31, 1981
4164078 Electronic quiz apparatus Aug. 14, 1979
4126949 Educational calculator Nov. 28, 1978
4085523 Teaching machine Apr. 25, 1978
4075771 Toy simulating a calculator Feb. 28, 1978
4051608 Teaching machine Oct. 4, 1977
3977092 Teaching machine card Aug. 31, 1976
3974575 Teaching machine Aug. 17, 1976

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