Modularized visual training aid for classroom instruction

Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor

Patent

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D19 60

Patent

active

D03613488

REFERENCES:
patent: D219408 (1970-12-01), Frish
patent: D252758 (1979-08-01), Prall
patent: D284875 (1986-07-01), Howard
patent: D323338 (1992-01-01), Count

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