Door operator

Details Door operator Door operator

1991-11-15

1993-06-15

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Closure

Patent

active

D03365239

REFERENCES:
patent: 1043492 (1912-11-01), Werner et al.
patent: 1172561 (1916-02-01), Rowntree
patent: 1263628 (1918-04-01), Vallen
patent: 1796660 (1931-03-01), Morse
patent: 2525683 (1950-10-01), Keely
patent: 2746540 (1956-05-01), Dixon
patent: 2905463 (1959-09-01), Broden
patent: 2952312 (1960-09-01), Young et al.
patent: 3207500 (1965-09-01), Kooy
patent: 3321003 (1967-05-01), Boerner
patent: 3658112 (1972-04-01), Iwaizumi
patent: 3809144 (1974-05-01), Garufo
patent: 3872622 (1975-03-01), Berk
Belanger Cloth Car Wash Systems Brochure D6-SM-1-81.
Photographs of Prior Art Door.

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