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Title:
ドリルヘッド
Document Type and Number:
Japanese Patent JP4940480
Kind Code:
B2
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Inventors:
Kazuo Haga
Yoshikazu Yatani
Application Number:
JP2009206733A
Publication Date:
May 30, 2012
Filing Date:
September 08, 2009
Export Citation:
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Assignee:
Yamamoto Rock Machine Co., Ltd.
International Classes:
E21B6/02; E21B17/02; E21B17/05
Domestic Patent References:
JP2001173358A
JP10037645A
JP4077689U
JP6071587U
JP7020387U
Attorney, Agent or Firm:
Sadanobu Shimizu



 
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