Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1996-10-08
1998-03-10
Clark, Doris
Building units and construction elements
Architectural stock material
Construction block or brick type
2501
Patent
active
D03920526
REFERENCES:
patent: 3145502 (1964-08-01), Rubenstein
patent: 4335549 (1982-06-01), Dean, Jr.
Clark Doris
E. P. Henry Corporation
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