Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1993-12-21
1995-09-12
Clark, Doris
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03623220
REFERENCES:
patent: 2397119 (1946-03-01), Bohn
patent: 2817619 (1957-12-01), Bickel et al.
patent: 3936989 (1976-02-01), Hancock
Clark Doris
Wong James A.
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