Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1986-10-01
1988-05-17
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
D25113
Patent
active
D02957906
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The Hollow Building Tile Assoc. Handbook, p. 11, Jan. 1924.
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Keystone Retaining Wall & Systems, Inc.
Word A. Hugo
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