Architectural learning device

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

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Patent

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D03106861

REFERENCES:
patent: 2214988 (1940-09-01), Bolhuis
patent: 2936530 (1960-05-01), Bowen
patent: 3153299 (1964-10-01), Jennings
patent: 4650437 (1987-03-01), Sitkus

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