Building units and construction elements – Architectural stock material – Extruded shape
Patent
1990-01-29
1992-03-10
Word, A. Hugo
Building units and construction elements
Architectural stock material
Extruded shape
D20 44
Patent
active
D03245764
REFERENCES:
patent: 3712005 (1973-01-01), Eschbach et al.
patent: 4676039 (1987-06-01), Leiter et al.
patent: 4802296 (1989-02-01), Kovalak, Jr.
APCO Graphics, Inc.
Clark Doris
Word A. Hugo
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