Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1995-11-07
1997-01-21
Barkai, Raphael
Building units and construction elements
Architectural stock material
Construction block or brick type
D21108
Patent
active
D03775321
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patent: 3284946 (1966-11-01), Christiansen
patent: 3324619 (1967-06-01), Gearhart
patent: 3862512 (1975-01-01), Vogel
patent: 4026086 (1977-05-01), Langley
patent: 4182072 (1980-01-01), Much
patent: 4965979 (1990-10-01), Larrivee et al.
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