Title:
【発明の名称】掘削トルク切換装置とトルク設定信号入力方法
Document Type and Number:
Japanese Patent JP2721629
Kind Code:
B2
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Inventors:
AJIRO SHUICHI
TAKEDA KOJI
TAKEDA KOJI
Application Number:
JP33252392A
Publication Date:
March 04, 1998
Filing Date:
November 18, 1992
Export Citation:
Assignee:
HITACHI KENKI KK
International Classes:
E02F3/06; E02F9/22; E21B3/02; (IPC1-7): E21B3/02; E02F9/22
Attorney, Agent or Firm:
Shoichi Wakata