Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1994-10-06
1996-03-26
Clark, Doris
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03683133
REFERENCES:
patent: D245340 (1977-08-01), Johnson
patent: 1086975 (1914-02-01), Aaronson
patent: 3430093 (1969-03-01), Landes et al.
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