Window vent

Details Window vent Window vent

1981-03-09

1983-10-18

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Closure

D2502

Patent

active

D02710544

REFERENCES:
patent: 891824 (1908-06-01), Dirkes
patent: 994961 (1911-06-01), Steinhelper
patent: 995237 (1911-06-01), Esender
patent: 1137139 (1915-04-01), Higgin
patent: 2019200 (1935-10-01), Stern
patent: 2075894 (1937-04-01), Gebhardt
patent: 2484922 (1949-10-01), Allen
patent: 2673513 (1954-03-01), Omholdt

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