Document Type and Number:
Japanese Patent JPH01120538
Kind Code:
U
Application Number:
JP1346588U
Publication Date:
August 15, 1989
Filing Date:
February 01, 1988
Export Citation:
International Classes:
E02D11/00; E02D7/20; E02D7/22; E02D13/00; E21B7/20; (IPC1-7): E02D11/00