Building units and construction elements – Prefabricated unit – Closure
Patent
1993-09-27
1995-01-24
Clark, Doris
Building units and construction elements
Prefabricated unit
Closure
Patent
active
D03548171
REFERENCES:
patent: 1233530 (1917-07-01), Whitnell
patent: 4575965 (1986-03-01), Iversen
Kovacs John C.
Kunz Fred A.
Clark Doris
Saf-T-Screens, Inc.
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