Underground tornado shelter

Details Underground tornado shelter Underground tornado shelter

1975-03-24

1977-01-04

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Underground service vault

D2503

Patent

active

D02429241

REFERENCES:
patent: 3145640 (1964-08-01), Jaha
patent: 3212220 (1965-10-01), Boniecki et al.
patent: 3230911 (1966-01-01), Garlock, Jr.

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