Math teaching board

Details Math teaching board Math teaching board

1977-06-17

1979-06-05

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

D1907

Patent

active

D02520338

REFERENCES:
patent: 687288 (1901-11-01), Thompson
patent: 1649578 (1927-11-01), Deming
patent: 2494469 (1950-01-01), Booth
patent: 2645041 (1953-07-01), Merrill
patent: 3171217 (1965-03-01), Birdsall

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