Document Type and Number:
Japanese Patent JPS5456601
Kind Code:
U
Application Number:
JP13278677U
Publication Date:
April 19, 1979
Filing Date:
September 29, 1977
Export Citation:
International Classes:
B25D17/24; E21B7/02; E21B15/00; E21B19/08; (IPC1-7): E21C11/00; B25D17/24