Membership
Tour
Register
Log in
Hisaya Yoshioka
Follow
Person
Kawaguchi, JP
People
Overview
Industries
Organizations
People
Information
Impact
Patents Grants
last 30 patents
Information
Patent Grant
Tail packing for a slurry pressurized shield
Patent number
4,209,268
Issue date
Jun 24, 1980
Ohbayashi-Gumi, Ltd.
Toshio Fujiwara
E21 - EARTH DRILLING MINING