Document Type and Number:
Japanese Patent JPS5253126
Kind Code:
Y2
Application Number:
JP3257972U
Publication Date:
December 02, 1977
Filing Date:
March 18, 1972
Export Citation:
International Classes:
E02F5/02; E02D17/13; E02F3/06; E02F7/00; E21B7/00; E21B19/22; (IPC1-7): E02D17/14