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Gas-fired heating unit
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Patent number 7,708,555
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Issue date May 4, 2010
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Ceramat, S.Coop.
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Alexander Groehl
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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Gas-fired heating apparatus
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Patent number 7,341,448
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Issue date Mar 11, 2008
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Ceramat, S.Coop.
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Alexander Groehl
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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Gas-fired heating apparatus
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Patent number 7,252,052
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Issue date Aug 7, 2007
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Ceramat, S.Coop.
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Alexander Groehl
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES