Membership
Tour
Register
Log in
Shunji Nishi
Follow
Person
Kitakyushu, JP
People
Overview
Industries
Organizations
People
Information
Impact
Patents Grants
last 30 patents
Information
Patent Grant
Threaded joint for oil-well pipe
Patent number
4,830,411
Issue date
May 16, 1989
Nippon Steel Corporation
Eiji Tsuru
E21 - EARTH DRILLING MINING