Document Type and Number:
Japanese Patent JPS5623941
Kind Code:
B2
Application Number:
JP15583475A
Publication Date:
June 03, 1981
Filing Date:
December 27, 1975
Export Citation:
International Classes:
B21C37/00; B21D9/12; B21D11/12; B21D19/12; C04B14/48; E04C5/02