Title:
APPARATUS FOR EXCAVATING TUNNELS
United States Patent 3433532

Inventors:
Enz, Robert W.
Publication Date:
03/18/1969
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Assignee:
Robert, Enz W.
Primary Class:
299/31
Other Classes:
299/60, 175/106, 299/85.100, 175/94
International Classes:
E21D9/10; E21C1/00; E21C29/00; E21C13/00




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