Window security grating

Details Window security grating Window security grating

1980-08-25

1983-06-14

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Closure

D25 40, D25 87, D25 89, D2502

Patent

active

D02693801

REFERENCES:
patent: D82778 (1930-12-01), Armstrong
patent: D193249 (1962-07-01), O'Donaughy
patent: D194454 (1963-01-01), Smith
patent: 2476689 (1949-07-01), Wakefield
patent: 2657746 (1953-11-01), Macklanburg

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