Document Type and Number:
Japanese Patent JPH0340643
Kind Code:
B2
Application Number:
JP21247484A
Publication Date:
June 19, 1991
Filing Date:
October 12, 1984
Export Citation:
International Classes:
B21C1/00; B21B1/16; B21B13/00; B21B19/06; B21B23/00
Next Patent: JPH0340644