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Ralf Walker
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Duisburg, DE
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Patents Grants
last 30 patents
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Patent Grant
Roadheading or mining machine with roof bolt drilling and setting d...
Patent number
7,316,456
Issue date
Jan 8, 2008
Voest-Alpine Bergtechnik Gesellschaft m.b.H.
Ralf Walker
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
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Patent Application
Roadheading or mining machine with roof bolt drilling and setting d...
Publication number
20050129466
Publication date
Jun 16, 2005
VOEST-ALPINE Bergtechnik Gesellschaft m.b.H.
Ralf Walker
E21 - EARTH DRILLING MINING