Membership
Tour
Register
Log in
Ian Gravill
Follow
Person
Aberdeen, GB
People
Overview
Industries
Organizations
People
Information
Impact
Patents Grants
last 30 patents
Information
Patent Grant
Seal assembly with backup elements having coil springs positioned t...
Patent number
6,173,964
Issue date
Jan 16, 2001
Greene, Tweed of Delaware, Inc.
Merle L. Bell
E21 - EARTH DRILLING MINING