Membership
Tour
Register
Log in
Gerhard Sprenger
Follow
Person
Lunen, DE
People
Overview
Industries
Organizations
People
Information
Impact
Patents Grants
last 30 patents
Information
Patent Grant
Advanceable mine roof supports
Patent number
4,978,248
Issue date
Dec 18, 1990
Gewerkschaft Eisenhutte Westfalia, GmbH
Gerhard Sprenger
E21 - EARTH DRILLING MINING