Document Type and Number:
Japanese Patent JPS4920868
Kind Code:
B1
Application Number:
JP367370A
Publication Date:
May 28, 1974
Filing Date:
January 12, 1970
Export Citation:
International Classes:
B21B37/28
Domestic Patent References:
| JP46031725A |
Foreign References:
| US3248916A | 1966-05-03 |