Building units and construction elements – Prefabricated unit – Closure
Patent
1982-10-13
1985-01-08
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Closure
D25 53
Patent
active
D02771381
REFERENCES:
patent: 1060456 (1913-04-01), Hockett
patent: 1198579 (1916-09-01), Rich
patent: 2893484 (1959-07-01), Gordon
patent: 2938248 (1960-05-01), Hadary
patent: 3733758 (1973-05-01), Maier et al.
patent: 4214405 (1980-07-01), Chupik
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