Mathematical educational device

Details Mathematical educational device Mathematical educational device

1989-11-13

1991-12-31

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

D19 64

Patent

active

D03228126

REFERENCES:
patent: D256028 (1980-07-01), Lawrence et al.
patent: D269356 (1983-06-01), Yoshioka et al.
patent: D283403 (1982-04-01), Chan
patent: D290815 (1987-07-01), Fenne
patent: D310094 (1990-08-01), Noguchi

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