Title:
【考案の名称】竪孔掘削機
Document Type and Number:
Japanese Patent JP2546189
Kind Code:
Y2
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Inventors:
Mizuta Sadachika
Kikuji Egawa
Kikuji Egawa
Application Number:
JP9398890U
Publication Date:
August 27, 1997
Filing Date:
September 10, 1990
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
International Classes:
E21B3/00; E21B7/20; (IPC1-7): E21B7/20; E21B3/00
Domestic Patent References:
| JP63223292A | ||||
| JP58134479U | ||||
| JP4884301U | ||||
| JP64696U |
Attorney, Agent or Firm:
Shigefumi Okamoto (1 person outside)
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