Title:
Underground shelter
United States Patent 3173387


Inventors:
Cree Jr., George Benson
Application Number:
US9717961A
Publication Date:
03/16/1965
Filing Date:
03/21/1961
Assignee:
Cree Jr., George Benson
Primary Class:
Other Classes:
52/20, 52/66, 52/169.5, 52/169.6, 109/58
International Classes:
E04H9/12
View Patent Images:
US Patent References:
2968130Protective underground shelter1961-01-17
2955549Atomic explosion shelter1960-10-11
2871802Tank type disaster shelter1959-02-03
1350306Manhole construction1920-08-24