Title:
DEPTH DETECTING APPARATUS FOR SHAFT HOLE DRILL MACHINE
Document Type and Number:
Japanese Patent JPS58207482
Kind Code:
A
Inventors:
KUSUMI HIROSHI
Application Number:
JP8878782A
Publication Date:
December 02, 1983
Filing Date:
May 27, 1982
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E21B44/00; E21B47/04; (IPC1-7): E21B44/00
Attorney, Agent or Firm:
Masami Akimoto
Previous Patent: REPAIRING OF WELL
Next Patent: DEPTH DETECTING APPARATUS FOR SHAFT HOLE DRILL MACHINE
Next Patent: DEPTH DETECTING APPARATUS FOR SHAFT HOLE DRILL MACHINE