Document Type and Number:
Japanese Patent JPS57105182
Kind Code:
U
Application Number:
JP17959480U
Publication Date:
June 29, 1982
Filing Date:
December 16, 1980
Export Citation:
International Classes:
B25D9/00; E21B1/00; E21B1/26; (IPC1-7): B25D9/00; E21C3/20