Document Type and Number:
Japanese Patent JPS5371603
Kind Code:
U
Application Number:
JP15323576U
Publication Date:
June 15, 1978
Filing Date:
November 17, 1976
Export Citation:
International Classes:
B25D17/10; E21B1/00; E21B44/00; (IPC1-7): E21C3/32; B25D17/10