Document Type and Number:
Japanese Patent JPS5528672
Kind Code:
U
Application Number:
JP11149378U
Publication Date:
February 25, 1980
Filing Date:
August 16, 1978
Export Citation:
International Classes:
B25B27/28; B25B27/00; E21B1/00; E21B17/00; E21B17/03; (IPC1-7): E21B17/00; B25B27/00