Building units and construction elements – Prefabricated unit – Closure
Patent
1989-11-21
1992-07-28
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Closure
Patent
active
D03283542
REFERENCES:
patent: D299961 (1989-02-01), Beichtold
patent: 3934383 (1976-01-01), Perry et al.
patent: 4300440 (1981-11-01), Holter
patent: 4750502 (1988-06-01), Bechtold
patent: 4796400 (1989-01-01), Molder
1981 Sweets Catalog 7,8/mo-section p. 7 extreme bottom left side of page silhouette illustration.
Clark Doris
Sanwa Shutter Corporation
Word A. Hugo
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