Building units and construction elements – Prefabricated unit – Closure
Patent
1976-06-24
1978-01-24
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Closure
D2502
Patent
active
D02470470
REFERENCES:
patent: 2889900 (1959-06-01), Singleton
patent: 3212140 (1965-10-01), Byrka
patent: 3331161 (1967-07-01), Ruff
patent: 3433957 (1969-03-01), Nelson
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