Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1986-03-20
1989-07-18
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03023125
REFERENCES:
patent: 4641470 (1987-02-01), Baumberger
patent: 4671039 (1987-06-01), Hunt
The Dow Chemical Company
Word A. Hugo
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