Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1994-08-08
1996-03-05
Clark, Doris
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03677150
REFERENCES:
patent: D305570 (1990-01-01), Sakata
patent: 1317183 (1919-09-01), Straight
patent: 2154213 (1939-04-01), Noce
patent: 4936712 (1995-06-01), Glickman
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