Document Type and Number:
Japanese Patent JPS5289401
Kind Code:
U
Application Number:
JP17544175U
Publication Date:
July 04, 1977
Filing Date:
December 26, 1975
Export Citation:
International Classes:
B25D9/12; E21B1/00; E21B1/26; (IPC1-7): E21C3/20; B25D9/12