Concrete block

Details Concrete block Concrete block

1992-01-22

1993-10-26

Word, A. Hugo

Building units and construction elements

Architectural stock material

Construction block or brick type

Patent

active

D03407756

REFERENCES:
patent: D245340 (1977-08-01), Johnson
patent: 783452 (1905-02-01), Morenus
patent: 1771275 (1930-07-01), Stamm
patent: 1953154 (1934-04-01), Cram
patent: 2201110 (1940-05-01), Makram
patent: 2316319 (1943-04-01), Demarest
patent: 2482556 (1949-09-01), Petras
patent: 4516364 (1985-05-01), Heider

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