Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1984-04-04
1988-02-16
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
D22120, D22194
Patent
active
D02943018
REFERENCES:
patent: 1041578 (1912-10-01), Bell et al.
patent: 1598584 (1926-08-01), Jones
patent: 2950057 (1960-08-01), Speer
patent: 3355849 (1967-12-01), Hancock
patent: 3469783 (1969-09-01), Uralli et al.
patent: 4147304 (1979-04-01), Blyton
patent: 4148166 (1979-04-01), Toone
patent: 4267969 (1981-05-01), Hales et al.
Denk Paul M.
Word A. Hugo
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