Title:
【発明の名称】掘削ビットの礫破砕装置
Document Type and Number:
Japanese Patent JP2530905
Kind Code:
B2
Inventors:
OOTOMO MOTOO
Application Number:
JP31829588A
Publication Date:
September 04, 1996
Filing Date:
December 16, 1988
Export Citation:
Assignee:
TOKIMETSUKU KK
TOYO KISO KOGYO KK
TOYO KISO KOGYO KK
International Classes:
E21B10/16; E02D13/08; E21B10/18; E21B10/32; E21B11/00; (IPC1-7): E21B11/00; E02D13/08
Domestic Patent References:
| JP1151615A |
Attorney, Agent or Firm:
Susumu Takeuchi (1 person outside)