【発明の名称】穿孔装置及び穿孔方法

Title:

【発明の名称】穿孔装置及び穿孔方法

Document Type and Number:

Japanese Patent JP2779690

Kind Code:

B2

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Inventors:

NAKANO SUMIO
KOKUBU SHIGEO
OOHARA TAKAHIKO
MATSUZAWA KUNIHIKO

Application Number:

JP11175590A

Publication Date:

July 23, 1998

Filing Date:

May 01, 1990

Export Citation:

Assignee:

TAISEI KENSETSU KK
MITSUBISHI JUKOGYO KK

International Classes:

E21B19/24; B28D1/14; B28D1/26; E21B3/00; E21B6/00; E21B6/02; (IPC1-7): E21B6/00; E21C1/12

Attorney, Agent or Firm:

Sakuo Yamaguchi

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