Document Type and Number:
Japanese Patent JPS6235843
Kind Code:
B2
Inventors:
YOKAI MASAYUKI
Application Number:
JP4602481A
Publication Date:
August 04, 1987
Filing Date:
March 28, 1981
Export Citation:
Assignee:
KOGYO GIJUTSUIN
International Classes:
B21B19/04; B21B23/00; B21B25/02; B21C1/16; B21C3/14