Shutter

Building units and construction elements – Prefabricated unit – Closure

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D2502

Patent

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D02521598

REFERENCES:
patent: D233230 (1974-10-01), Hashiba
patent: D244941 (1977-07-01), Hashiba
patent: 3840061 (1974-10-01), Herms
patent: 3961659 (1976-06-01), Siegel
Sweet's Architectural Catalog File, 1976, section 8.7/Co, p. 19, door illustration at top left of page.

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