Building units and construction elements – Prefabricated unit – Closure
Patent
1997-12-04
1999-01-12
Clark, Doris
Building units and construction elements
Prefabricated unit
Closure
2502
Patent
active
D04041429
REFERENCES:
patent: D213676 (1969-04-01), Biro
patent: 2556407 (1951-06-01), Wilke
patent: 2568130 (1951-09-01), Olson
patent: 2705350 (1955-04-01), West et al.
patent: 2747241 (1956-05-01), Marousky
patent: 2780328 (1957-02-01), Yoder
Clark Doris
Gretsch-Unitas GmbH
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