Title:
マストガタつき防止装置
Document Type and Number:
Japanese Patent JP4818758
Kind Code:
B2
Inventors:
Yutaka Hyuga
Application Number:
JP2006059286A
Publication Date:
November 16, 2011
Filing Date:
March 06, 2006
Export Citation:
Assignee:
Furukawa Rock Drill Co., Ltd.
International Classes:
E21B7/02; E21B15/00
Domestic Patent References:
| JP10088955A | ||||
| JP6307407A | ||||
| JP8326463A | ||||
| JP2003074286A |
Attorney, Agent or Firm:
Tetsuya Mori
Yoshiaki Naito
Hide Tanaka Tetsu
Yoshiaki Naito
Hide Tanaka Tetsu