Title:
【発明の名称】掘削工具
Document Type and Number:
Japanese Patent JP2822683
Kind Code:
B2
Inventors:
Daishiro Miyazaki
Takeshi Hayashi
Kihara Yasushi
Takeshi Hayashi
Kihara Yasushi
Application Number:
JP7127391A
Publication Date:
November 11, 1998
Filing Date:
April 03, 1991
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
E21B3/00; E21B10/32; E21B10/46; (IPC1-7): E21B10/32
Domestic Patent References:
| JP6311789A | ||||
| JP63219792A | ||||
| JP441891A |
Attorney, Agent or Firm:
Masatake Shiga (2 outside)