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Harry J. Fitzgerald
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Pittsburgh, PA, US
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last 30 patents
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Patent Grant
Mining method and apparatus
Patent number
4,378,132
Issue date
Mar 29, 1983
Klaus Spies
E21 - EARTH DRILLING MINING
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Patent Grant
Excavation roof support and method of installing the same
Patent number
4,277,204
Issue date
Jul 7, 1981
Bochumer Eisenhutte Heintzmann GmbH & Co
Manfred Koppers
E21 - EARTH DRILLING MINING