Title:
Tunneling machine steering system
United States Patent 3345108
US Patent References:
/1311142.html
- - 1311142

Steerable tunnel-drilling machine
- - 3295892


Inventors:
Newman, Elmer F.
Parker, William H.
Publication Date:
10/03/1967
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Assignee:
HUGHES TOOL CO
Primary Class:
299/31
Other Classes:
299/58
International Classes:
E21D9/10
Foreign References:
GB254839A