【発明の名称】掘削工具 - Mitsubishi Materials Corporation

Title:

【発明の名称】掘削工具

Document Type and Number:

Japanese Patent JP3067237

Kind Code:

B2

Inventors:

Daishiro Miyazaki
Takeshi Hayashi
Yasushi Kihara

Application Number:

JP7127291A

Publication Date:

July 17, 2000

Filing Date:

April 03, 1991

Export Citation:

Assignee:

Mitsubishi Materials Corporation

International Classes:

E21B3/00; E21B10/32; E21B10/46; (IPC1-7): E21B3/00; E21B10/32

Domestic Patent References:

Attorney, Agent or Firm:

Masatake Shiga (1 person outside)

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