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2897795
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Patent number 2,897,795
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Issue date Aug 4, 1959
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F22 - STEAM GENERATION
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2887095
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Patent number 2,887,095
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Issue date May 19, 1959
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F22 - STEAM GENERATION
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2887096
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Patent number 2,887,096
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Issue date May 19, 1959
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F24 - HEATING RANGES VENTILATING
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2877746
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Patent number 2,877,746
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Issue date Mar 17, 1959
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F22 - STEAM GENERATION
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2745389
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Patent number 2,745,389
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Issue date May 15, 1956
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F22 - STEAM GENERATION
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2654352
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Patent number 2,654,352
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Issue date Oct 6, 1953
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F22 - STEAM GENERATION
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1883124
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Patent number 1,883,124
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Issue date Oct 18, 1932
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F22 - STEAM GENERATION
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1826293
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Patent number 1,826,293
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Issue date Oct 6, 1931
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F22 - STEAM GENERATION
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1746711
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Patent number 1,746,711
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Issue date Feb 11, 1930
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F22 - STEAM GENERATION