Title:
削孔方法
Document Type and Number:
Japanese Patent JP4890499
Kind Code:
B2
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Inventors:
Youichi Nakano
Kunihiko Izumi
Hiroshi Yamaji
Yuji Nagano
Kunihiko Izumi
Hiroshi Yamaji
Yuji Nagano
Application Number:
JP2008133986A
Publication Date:
March 07, 2012
Filing Date:
May 22, 2008
Export Citation:
Assignee:
Sumitomo Mitsui Construction Co., Ltd.
International Classes:
E21B6/00
Domestic Patent References:
| JP8199960A | ||||
| JP59114395A | ||||
| JP61080891U | ||||
| JP2003221995A | ||||
| JP8246791A | ||||
| JP9328991A |
Attorney, Agent or Firm:
Patent business corporation Oshima patent office
Yoichi Oshima
Yoichi Oshima