段付き金属管の製造方法及び拡管用プラグ - Nippon Steel & Sumitomo Metal Corporation

Title:

段付き金属管の製造方法及び拡管用プラグ

Document Type and Number:

Japanese Patent JP5255809

Kind Code:

B2

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Inventors:

Masayoshi Akiyama
Tatsuya Okui
Koichi Kuroda
Michihiro Asano

Application Number:

JP2007265309A

Publication Date:

August 07, 2013

Filing Date:

October 11, 2007

Export Citation:

Assignee:

Nippon Steel & Sumitomo Metal Corporation
Nice Co., Ltd.

International Classes:

B21D41/02; B21D39/20

Domestic Patent References:

Attorney, Agent or Firm:

Hidetoshi Ueba
Tadashi Takezoe

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