Liner plate
United States Patent 3357194
US Patent References:
/0971558.html
- - 0971558

/0977944.html
- - 0977944

Expanding ring for tunnel linings
- - 2148783

Liner segment
- - 2217292

Culvert pipe
- - 2536758


Inventors:
Fisher, Christopher L.
Publication Date:
12/12/1967
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Assignee:
ARMCO STEEL CORP
Primary Class:
405/153
International Classes:
E21D11/15; E21D11/14
US Patent References:
2841297Method of and apparatus for constructing tunnels