Method of constructing tunnels
United States Patent 2895299
US Patent References:
/0168146.html
- - 0168146

/1195147.html
- - 1195147

Highway culvert
- - 1638428

Sectional tunnel
- - 1642559

Tunnel apparatus
- - 1814852


Inventors:
Washabaugh, Edward P.
Publication Date:
07/21/1959
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Assignee:
AMERICAN MARIETTA CO
Primary Class:
405/134
Other Classes:
414/776, 414/910, 405/151, 414/620, 405/138
International Classes:
E21D11/08; E21D11/40
US Patent References:
2172030Tunnel lining
2230032Underground tubular structure and method of making the same
Foreign References:
AU1019333A
GB506453A
GB514793A
AU111556B