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Hydraulic circuit for longwall mining
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Patent number 8,960,807
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Issue date Feb 24, 2015
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Tiefenbach Control Systems GmbH
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Wilfried Weigel
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F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
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Prop control valve
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Patent number 4,694,730
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Issue date Sep 22, 1987
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Hermann Hemschedit Maschinenfabrik GmbH & Co.
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Karl Krieger
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E21 - EARTH DRILLING MINING
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Hydraulic valve control apparatus
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Patent number 4,676,698
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Issue date Jun 30, 1987
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Hermann Hemscheidt Maschinenfabrik GmbH & Co.
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Karl Krieger
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E21 - EARTH DRILLING MINING
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Valves
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Patent number 4,643,392
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Issue date Feb 17, 1987
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Dobson Park Industries PLC.
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Richard Ward
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G05 - CONTROLLING REGULATING
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Hydraulic control device
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Patent number 4,622,998
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Issue date Nov 18, 1986
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Gewerkschaft Eisenhutte Westfalia
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Willy Kussel
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E21 - EARTH DRILLING MINING
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Hydraulic control arrangement
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Patent number 4,586,424
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Issue date May 6, 1986
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Bochumer Eisenhutte Heintzmann GmbH & Co. KG
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Ernst-Gunter Nerlich
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E21 - EARTH DRILLING MINING
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Control apparatus
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Patent number 4,572,709
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Issue date Feb 25, 1986
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Gewerkschaft Eisenhutte Westfalia
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Walter Weirich
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E21 - EARTH DRILLING MINING
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Control valve
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Patent number 4,564,047
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Issue date Jan 14, 1986
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Fletcher Sutcliffe Wild Limited
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Lewis R. B. Bower
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E21 - EARTH DRILLING MINING
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