Title:
CONTINUOUS TUNNEL BORER
United States Patent 3493165
US Patent References:
Steerable tunnel-drilling machine
- - 3295892
Tunnelling machine having cylindrical rotor and central conveyor
- - 3307876
Earth boring machine
- - 3379264
Steerable tunnel-drilling machine
- - 3295892
Tunnelling machine having cylindrical rotor and central conveyor
- - 3307876
Earth boring machine
- - 3379264
Inventors:
Schonfeld, Georg
Publication Date:
02/03/1970
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Assignee:
Georg, Schonfeld
Primary Class:
Other Classes:
299/56, 175/94, 299/110
International Classes:
E21D9/10; E21D9/11; E21C1/10; E21C29/02; E21C13/00