Augering machine for mining upwardly and downwardly at steep angles
United States Patent 3346055

Inventors:
Young, William G.
Publication Date:
10/10/1967
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Assignee:
SALEM TOOL CO
Primary Class:
173/37
Other Classes:
173/189, 91/420, 299/31, 299/55, 173/152
International Classes:
E21B7/02; E21C25/58; E21C35/06; E21C25/00; E21C35/00
US Patent References:
2906515Auger type mining machine
2935309Mining machine having independently operable skids
3015316Counterbalance valves and the like
3107738Hydraulically operable horizontal drilling apparatus
3208698Adjustable column support