Document Type and Number:
Japanese Patent JPS5536480
Kind Code:
B2
Application Number:
JP2788072A
Publication Date:
September 20, 1980
Filing Date:
March 17, 1972
Export Citation:
International Classes:
E02F5/30; B23K28/00; B26F3/00; B63B22/28; E04G23/08; E21B29/02; F42D3/00