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Jorg Schade
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Datteln, DT
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last 30 patents
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Patent Grant
Mine support assemblies
Patent number
3,971,225
Issue date
Jul 27, 1976
Becorit Grubenausbau GmbH
Wilhelm Wertelewski
E21 - EARTH DRILLING MINING
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Patent Grant
Mine roof shield
Patent number
3,949,563
Issue date
Apr 13, 1976
Becorit Grubenausbau GmbH
Wilhelm Wertelewski
E21 - EARTH DRILLING MINING