Title:
アースドリル用高低速切換回路
Document Type and Number:
Japanese Patent JP3579232
Kind Code:
B2
Inventors:
Akio Kiue
Application Number:
JP32641697A
Publication Date:
October 20, 2004
Filing Date:
November 27, 1997
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E21B3/02; E21B3/035; F04B49/00; (IPC1-7): F04B49/00; E21B3/02
Domestic Patent References:
| JP4202996A | ||||
| JP4237875A | ||||
| JP6074145A | ||||
| JP59079078A | ||||
| JP5223053A | ||||
| JP63159676A |
Attorney, Agent or Firm:
Fuyuki Nagai