Z-shaped building block

Details Z-shaped building block Z-shaped building block

1989-09-21

1992-05-26

Word, A. Hugo

Building units and construction elements

Architectural stock material

Construction block or brick type

Patent

active

D03265307

REFERENCES:
patent: 106651 (1870-08-01), Beidler
patent: 140835 (1873-07-01), Kilburn
patent: 338490 (1886-03-01), Cowan
patent: 3196582 (1965-07-01), Rosenfeld
patent: 3546792 (1970-12-01), Sherman

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