Title:
VERTICAL HOLE DRILLING APPARATUS
Document Type and Number:
Japanese Patent JPS60192083
Kind Code:
A
Inventors:
SHIBATA TSUGIO
Application Number:
JP4633284A
Publication Date:
September 30, 1985
Filing Date:
March 10, 1984
Export Citation:
Assignee:
SEIATSU KK
International Classes:
E21B7/00; E21B7/02; E21B15/00; (IPC1-7): E21B7/02; E21B15/00
Domestic Patent References:
| JPS58189494A | 1983-11-05 | |||
| JPS55132812A | 1980-10-16 |
Attorney, Agent or Firm:
Kobori Masashi
Previous Patent: JPS60192082
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