Document Type and Number:
Japanese Patent JPS5040801
Kind Code:
U
Application Number:
JP9364073U
Publication Date:
April 25, 1975
Filing Date:
August 10, 1973
Export Citation:
International Classes:
E21B25/02; E21B3/00; (IPC1-7): E21B3/00
Domestic Patent References:
| JP36023856A |