Security door

Details Security door Security door

1987-08-20

1990-04-24

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Closure

D25 53, D25152

Patent

active

D03074790

REFERENCES:
patent: 1846762 (1932-02-01), Scantlebury
patent: 2948366 (1960-08-01), Kelly et al.
patent: 3895669 (1975-07-01), Heeling
patent: 4810999 (1989-03-01), Moshier

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