Title:
両方向掘削ビット及びケーシングカッタ
Document Type and Number:
Japanese Patent JP4485706
Kind Code:
B2
Inventors:
Endo Atsushi
Application Number:
JP2001125497A
Publication Date:
June 23, 2010
Filing Date:
April 24, 2001
Export Citation:
Assignee:
Tungaloy Co., Ltd.
International Classes:
E21B10/48; E21B10/02
Domestic Patent References:
| JP8333978A | ||||
| JP11311082A | ||||
| JP7091932B2 | ||||
| JP7026477Y2 |