Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1996-09-20
1997-11-11
Barkai, Raphael
Building units and construction elements
Architectural stock material
Construction block or brick type
2501
Patent
active
D03862658
REFERENCES:
patent: 108068 (1870-10-01), Utley
patent: D250898 (1979-01-01), Schuring
patent: D252951 (1979-09-01), Schuring
patent: D326530 (1992-05-01), Lewis
patent: 338490 (1886-03-01), Cowans
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