Title:
DEVICE FOR AUTOMATICALLY DRIVING IRON PIPE IN WELL SINKING ETC*
Document Type and Number:
Japanese Patent JPS5358401
Kind Code:
A
Inventors:
ISO MASAO
Application Number:
JP13363876A
Publication Date:
May 26, 1978
Filing Date:
November 06, 1976
Export Citation:
Assignee:
ISO MASAO
International Classes:
E21B1/04; E21B1/02; (IPC1-7): E21B1/02
Domestic Patent References:
| JPS4742303A |