Document Type and Number:
Japanese Patent JPS50103126
Kind Code:
A
Application Number:
JP879875A
Publication Date:
August 14, 1975
Filing Date:
January 22, 1975
Export Citation:
International Classes:
E02F9/20; E21B1/00; E21B1/26; E21D9/10; (IPC1-7): E02F9/20