Belt elevator type educational toy

Details Belt elevator type educational toy Belt elevator type educational toy

1980-09-25

1981-10-06

Lee, Lester L.

Office supplies; artists and teachers materials

Teaching material

D1907

Patent

active

D02611562

REFERENCES:
patent: D234503 (1975-03-01), Ahrens
patent: D240818 (1976-08-01), Crawford

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