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Method of operating a heater
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Patent number 9,531,020
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Issue date Dec 27, 2016
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Delphi Technologies, Inc.
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Bernhard A. Fischer
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E21 - EARTH DRILLING MINING
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Geothermic heater system
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Patent number 9,476,283
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Issue date Oct 25, 2016
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Delphi Technologies, Inc.
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Bernhard A. Fischer
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E21 - EARTH DRILLING MINING
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Heater and method of operating
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Patent number 9,328,596
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Issue date May 3, 2016
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Delphi Technologies, Inc.
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Bernhard A. Fischer
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E21 - EARTH DRILLING MINING