Building units and construction elements – Prefabricated unit – Closure
Patent
1974-08-07
1977-07-05
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Closure
D2502
Patent
active
D02449412
REFERENCES:
patent: 856117 (1907-06-01), Waldmire
patent: 1442045 (1923-01-01), Burkhardt
patent: 2553123 (1951-05-01), Whiteside
patent: 3394518 (1968-07-01), Worrell, Jr.
patent: 3548555 (1970-12-01), Trostle et al.
patent: 3727361 (1973-04-01), Greene
Wenderoth E. F.
Word A. Hugo
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