Document Type and Number:
Japanese Patent JPS5664491
Kind Code:
U
Application Number:
JP14618679U
Publication Date:
May 30, 1981
Filing Date:
October 22, 1979
Export Citation:
International Classes:
E02F7/00; E02F7/02; E21C45/00; (IPC1-7): E21C45/00; E02F7/02