Title:
AIR REVERSING TYPE BORING SYSTEM
Document Type and Number:
Japanese Patent JPS52104401
Kind Code:
A
Inventors:
BOU NAOKI
Application Number:
JP2200076A
Publication Date:
September 01, 1977
Filing Date:
March 01, 1976
Export Citation:
Assignee:
TONE KOJI KK
International Classes:
E21B21/00; E21B21/06; (IPC1-7): E21B21/00
Domestic Patent References:
| JPS48888U | 1973-01-08 |