Title:
掘削工具
Document Type and Number:
Japanese Patent JP5402115
Kind Code:
B2
Inventors:
Masaya Hisada
Kazuyoshi Nakamura
Kazuyoshi Nakamura
Application Number:
JP2009061504A
Publication Date:
January 29, 2014
Filing Date:
March 13, 2009
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP.
International Classes:
E21B7/20; E21B1/30
Attorney, Agent or Firm:
Masatake Shiga
Norio Takahashi
Yasuhiko Murayama
Yanai Noriko
Norio Takahashi
Yasuhiko Murayama
Yanai Noriko