Mathematical aid

Details Mathematical aid Mathematical aid

1990-02-21

1991-06-25

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

Patent

active

D03177874

REFERENCES:
patent: D217770 (1970-06-01), Goldberg
patent: D231738 (1974-06-01), Brass
patent: D241856 (1976-10-01), Williams
patent: D265666 (1982-08-01), Nakao et al.

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