Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1994-05-19
1995-10-24
Clark, Doris
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03635589
REFERENCES:
patent: 364427 (1887-06-01), McCallip
patent: 2129211 (1938-09-01), Hickl
patent: 2446949 (1948-08-01), Deutra
patent: 3026076 (1962-03-01), Bender
patent: 3505764 (1970-04-01), Gutierrez
patent: 4328651 (1982-05-01), Gutierrez
patent: 4404780 (1983-09-01), Josephson
patent: 5152108 (1992-10-01), Madl, Jr.
Brooklin Concrete Products Limited
Clark Doris
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