Title:
【発明の名称】連続さく孔方法および連続さく孔装置
Document Type and Number:
Japanese Patent JP2915029
Kind Code:
B2
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Inventors:
SAITO SUMITAKA
YANAGIDA KENJI
YANAGIDA KENJI
Application Number:
JP31150589A
Publication Date:
July 05, 1999
Filing Date:
November 30, 1989
Export Citation:
Assignee:
HIRADO KINZOKU KOGYO KK
International Classes:
E21B3/00; E21B6/02; E21B19/08; E21B19/086; (IPC1-7): E21C1/12; E21C5/00
Domestic Patent References:
| JP62280489A |
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)