Speaking port

Details Speaking port Speaking port

1976-12-20

1978-08-15

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Closure

D25 48, D25 53, D25 87, D2502

Patent

active

D02489708

REFERENCES:
patent: 3871151 (1975-03-01), Der Estephanian
patent: 3906698 (1975-09-01), Oepping
patent: 4016699 (1977-04-01), Hurvitz

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