Wall mounted ventilation fan door

Details Wall mounted ventilation fan door Wall mounted ventilation fan door

1986-11-19

1989-07-18

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Closure

Patent

active

D03023117

REFERENCES:
patent: 304356 (1884-09-01), Perry
patent: 1275549 (1918-08-01), Frere
patent: 1514643 (1924-11-01), Wine
patent: 1677910 (1928-07-01), Wills
patent: 1687843 (1928-10-01), Miller
patent: 1713648 (1929-05-01), Feinberg
patent: 1735430 (1929-11-01), Girand
patent: 1761250 (1930-06-01), Baltes
patent: 2035234 (1936-03-01), Hoper
patent: 2084807 (1937-06-01), Hueglin
patent: 2398017 (1946-04-01), Lidin
1981 Sweets Catalog File, 8.12/KA, p. 1.

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