Shutter louver

Building units and construction elements – Prefabricated unit – Closure

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Patent

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D03349861

REFERENCES:
patent: D268875 (1983-05-01), Kohler
patent: 2142616 (1939-01-01), Otto
patent: 2901904 (1959-09-01), Weg
patent: 3447443 (1969-06-01), Silvey
patent: 3487768 (1970-01-01), Watson
patent: 3746042 (1973-07-01), Finkel
patent: 4481734 (1984-11-01), Vaida
patent: 4660613 (1987-04-01), Dagenais

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