Document Type and Number:
Japanese Patent JPS628013
Kind Code:
U
Application Number:
JP9990785U
Publication Date:
January 19, 1987
Filing Date:
June 28, 1985
Export Citation:
International Classes:
E21B1/12; B23B45/16; E21B1/00; E21B6/06; (IPC1-7): B23B45/16; E21C3/28
Domestic Patent References:
| JP50085892B |
Next Patent: SFC PROGRAMMING DEVICE