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F24 - HEATING RANGES VENTILATING
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Patent number 2,856,161
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 1,988,642
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F28 - HEAT EXCHANGE IN GENERAL
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F24 - HEATING RANGES VENTILATING
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F24 - HEATING RANGES VENTILATING
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F24 - HEATING RANGES VENTILATING
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F24 - HEATING RANGES VENTILATING
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Patent number 908,200
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F28 - HEAT EXCHANGE IN GENERAL
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F24 - HEATING RANGES VENTILATING
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F24 - HEATING RANGES VENTILATING
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F24 - HEATING RANGES VENTILATING
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F24 - HEATING RANGES VENTILATING