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3195516
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Patent number 3,195,516
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Issue date Jul 20, 1965
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F24 - HEATING RANGES VENTILATING
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Issue date Jul 25, 1961
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F22 - STEAM GENERATION
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1903515
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F22 - STEAM GENERATION
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Patent number 523,448
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Issue date Jul 24, 1894
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F22 - STEAM GENERATION