Four cavity building block

Details Four cavity building block Four cavity building block

1987-02-17

1989-11-07

Word, A. Hugo

Building units and construction elements

Architectural stock material

Construction block or brick type

Patent

active

D03045013

REFERENCES:
patent: D179185 (1956-11-01), Branham
patent: 1887701 (1932-11-01), Stevens
patent: 4597238 (1986-07-01), Vadala
patent: 4671039 (1987-06-01), Hunt

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