Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1987-10-01
1990-03-06
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
D25151
Patent
active
D03064891
REFERENCES:
patent: D21522 (1892-05-01), Lewis
patent: D23943 (1895-01-01), Cross
patent: D36806 (1904-02-01), Palmer
patent: D124533 (1941-01-01), Lebecque
patent: D161722 (1951-01-01), Waller
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