Building units and construction elements – Prefabricated unit – Closure
Patent
1971-08-30
1979-10-16
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Closure
D2502
Patent
active
D02531925
REFERENCES:
patent: 1693000 (1928-11-01), Sinclair
patent: 2294856 (1942-09-01), West
patent: 2767443 (1956-10-01), Hobein et al.
Dunn James T.
Powers-Fiat
Word A. Hugo
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