Storm cellar

Building units and construction elements – Prefabricated unit – Underground service vault

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D03371662

REFERENCES:
patent: D187067 (1960-01-01), Bascom
patent: D242924 (1977-01-01), McKnight
patent: D261432 (1981-10-01), Ballard
patent: 984942 (1911-02-01), Leddy
patent: 2936504 (1960-05-01), Harris
patent: 2977723 (1961-04-01), Rudinger
patent: 4539780 (1985-09-01), Rice
patent: 4615158 (1986-10-01), Thornton
Field Book of Natural History by L. Palmer, .COPYRGT.1949, McGraw Hill, pp. 353, 365, 367, Pond Snail and Sea Shells.

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