Title:
Oscillating tunneling machine
United States Patent 3355215

Inventors:
Haspert, John C.
Wallers, Richard A.
Publication Date:
11/28/1967
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Assignee:
SMITH IND INTERNATIONAL INC
Primary Class:
299/60
Other Classes:
299/31, 299/108, 299/71, 299/56, 299/112R, 299/33
International Classes:
E21D9/10; E21D9/11
US Patent References:
3185225Feeding apparatus for down hole drilling device
3219389Drive for adjustable cutting rollers
Foreign References:
DE66414C