Document Type and Number:
Japanese Patent JPS5122081
Kind Code:
Y2
Application Number:
JP9987771U
Publication Date:
June 08, 1976
Filing Date:
October 27, 1971
Export Citation:
International Classes:
F16L21/08; E21B17/08; F16B2/00; F16B7/18; F16B39/00; F16B39/12; (IPC1-7): E21B17/08; F16B2/00; F16B7/18; F16B39/00; F16L21/08