Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1997-12-22
1999-10-26
Zarfas, Louis S.
Building units and construction elements
Architectural stock material
Construction block or brick type
2501
Patent
active
D04158466
REFERENCES:
patent: D231926 (1974-06-01), Appleton et al.
patent: 3229439 (1966-01-01), Strobel
patent: 3494266 (1970-02-01), Baumberger
patent: 3602111 (1971-08-01), Clemente
patent: 3903702 (1975-09-01), Appleton
patent: 4919565 (1990-04-01), Gopfert
Delehanty Robert
Zarfas Louis S,.
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