Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1998-08-20
2000-08-08
Zarfas, Louis S.
Building units and construction elements
Architectural stock material
Construction block or brick type
2501
Patent
active
D04293436
REFERENCES:
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patent: 4761095 (1988-08-01), Bartlechner
patent: 4919565 (1990-04-01), Gopfert
"Kobbelstone Circle" stones, Krehling Industries, Inc. Sweet's General Building & Renovation Catalog File, 1993.
Delehanty Robert A.
Groupe Permacon Inc.
Zarfas Louis S,.
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