Document Type and Number:
Japanese Patent JPS6266988
Kind Code:
U
Application Number:
JP15638685U
Publication Date:
April 25, 1987
Filing Date:
October 15, 1985
Export Citation:
International Classes:
E21B10/32; E02D5/80; (IPC1-7): E21B10/32
Domestic Patent References:
| JPS607437U | 1985-01-19 | |||
| JPS5380201U | 1978-07-04 | |||
| JPS576090A | 1982-01-12 | |||
| JPS5991218A | 1984-05-25 | |||
| JPS515809A | 1976-01-19 |