Document Type and Number:
Japanese Patent JPS6220509
Kind Code:
Y2
Application Number:
JP16750880U
Publication Date:
May 25, 1987
Filing Date:
November 25, 1980
Export Citation:
International Classes:
F16L39/04; E02D3/12; F16L37/00; F16L39/00; (IPC1-7): E02D3/12; F16L39/00