Building units and construction elements – Prefabricated unit – Closure
Patent
1977-10-13
1980-07-01
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Closure
D2502
Patent
active
D02557207
REFERENCES:
patent: D213676 (1969-04-01), Biro
patent: 3878648 (1975-04-01), Maune
patent: 4044503 (1977-08-01), Maune
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