Title:
A manufacture device of a welding steel pipe, and a manufacturing method of the welding steel pipe using it
Document Type and Number:
Japanese Patent JP6172171
Kind Code:
B2
Inventors:
Aoki Tatsuro
Application Number:
JP2015012971A
Publication Date:
August 02, 2017
Filing Date:
January 27, 2015
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
B21D3/14; B21C37/30; B21D39/20
Domestic Patent References:
| JP49098365A | ||||
| JP3018926U | ||||
| JP2004249360A |
Attorney, Agent or Firm:
Ginza Marronnier Patent Office