【発明の名称】内面二重溝付管の製造方法

Title:

【発明の名称】内面二重溝付管の製造方法

Document Type and Number:

Japanese Patent JP2756194

Kind Code:

B2

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Inventors:

Koji Yamamoto
Hiroshi Kawaguchi
Toshiaki Hashizume

Application Number:

JP5838791A

Publication Date:

May 25, 1998

Filing Date:

February 28, 1991

Export Citation:

Assignee:

THE FURUKAW ELECTRIC CO.,LTD.

International Classes:

B21C1/22; B21C1/00; B21C3/16; B21D53/06; B21H7/14; F28F1/40; (IPC1-7): B21C1/22; B21C1/00

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