Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1996-10-22
1998-08-18
Barkai, Raphael
Building units and construction elements
Architectural stock material
Construction block or brick type
D25113, 2501
Patent
active
D03972305
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Keystone Retaining Wall Systems brochure, "The Perfect Combination of Beauty and Function".
Barkai Raphael
Keystone Retaining Wall & Systems, Inc.
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