Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1993-02-22
1994-10-25
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03519147
REFERENCES:
patent: D317048 (1991-05-01), Forsberg
patent: 1350399 (1920-08-01), Wilson
patent: 3222830 (1965-12-01), Ivang
patent: 4413924 (1983-11-01), Ijima
patent: 4514949 (1985-05-01), Crespo
Clark Doris
Roddy Kenneth A.
Word A. Hugo
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