Building units and construction elements – Prefabricated unit – Closure
Patent
1991-02-22
1993-04-13
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Closure
D30199
Patent
active
D03348091
REFERENCES:
patent: 3690299 (1972-09-01), Johnson
patent: 3874118 (1975-04-01), Robinson
patent: 3985174 (1976-10-01), Bricker
patent: 4322913 (1982-04-01), Himmer
patent: 4603724 (1986-08-01), Borwick
patent: 4760872 (1988-08-01), Hale, Jr.
patent: 4908987 (1990-03-01), Dickson et al.
Clark Doris
Word A. Hugo
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