Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1987-06-08
1988-11-08
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D02984636
REFERENCES:
patent: D237704 (1975-11-01), Lane
patent: 566924 (1896-09-01), Morrin
patent: 2882689 (1959-04-01), Huch et al.
patent: 3995434 (1976-12-01), Kato et al.
patent: 4016693 (1977-04-01), Warren
patent: 4312606 (1982-01-01), Sarikelle
patent: 4496226 (1985-01-01), Ruckstuhl
Concrete Masonry Pictorial, vol. 33, No. 3 C 1977, p. 35.
Keystone Retaining Wall & Systems, Inc.
Word A. Hugo
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