Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor
Patent
1974-10-15
1977-01-18
Stearman, Joel
Office supplies; artists and teachers materials
Teaching material
Demonstrator or exhibitor
D1907
Patent
active
D02430851
REFERENCES:
patent: 2374800 (1945-05-01), Bohlke
patent: 2826628 (1958-03-01), Kruse
patent: 3295226 (1967-01-01), Corcoran
Leybold Physics Catalog, July 1966, p. 117, control panels at center of page.
Rademaker C. A.
Schulze Herbert C.
Stearman Joel
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