Title:
【発明の名称】掘削工具
Document Type and Number:
Japanese Patent JP3064460
Kind Code:
B2
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Inventors:
Daishiro Miyazaki
Takeshi Hayashi
Yasushi Kihara
Takeshi Hayashi
Yasushi Kihara
Application Number:
JP7334991A
Publication Date:
July 12, 2000
Filing Date:
April 05, 1991
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
E21B3/00; E21B10/32; E21B10/36; E21B10/46; E21B10/60; (IPC1-7): E21B3/00; E21B10/36
Domestic Patent References:
| JP6311789A | ||||
| JP5976391A | ||||
| JP63312497A | ||||
| JP6285592U |
Attorney, Agent or Firm:
Masatake Shiga (2 outside)