Security gate with walk through feature

Details Security gate with walk through feature Security gate with walk through feature

1992-03-13

1993-11-09

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Railing unit or fence

Patent

active

D03412075

REFERENCES:
patent: 2896277 (1959-07-01), Halligan
patent: 3906698 (1975-09-01), Oepping
patent: 4150510 (1979-04-01), Harrison et al.
patent: 4607455 (1986-08-01), Bluem et al.
patent: 4671012 (1987-06-01), Merklinger et al.
patent: 4787174 (1988-11-01), Brown
patent: 4831777 (1989-05-01), Johnson, Jr.
patent: 5060421 (1991-10-01), Castelli

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