Ventilating concrete block

Details Ventilating concrete block Ventilating concrete block

1980-04-11

1982-06-15

Word, A. Hugo

Building units and construction elements

Structure

Simulative

D25 80, D25 91, D2501

Patent

active

D02649977

REFERENCES:
patent: D168221 (1952-11-01), Gonnella
patent: D196970 (1963-11-01), Fulwider
patent: D246386 (1977-11-01), Hardin

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