Concrete block

Details Concrete block Concrete block

1985-07-10

1988-05-17

Gandy, James M.

Building units and construction elements

Architectural stock material

Construction block or brick type

D25114

Patent

active

D02957892

REFERENCES:
patent: D254450 (1980-03-01), Pulse et al.
patent: 1092621 (1914-04-01), Worner
patent: 1234883 (1917-07-01), Douglass
patent: 3416276 (1968-12-01), Caputo et al.
patent: 3828509 (1974-08-01), Ottmar et al.

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