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1896299
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Patent number 1,896,299
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Issue date Feb 7, 1933
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F24 - HEATING RANGES VENTILATING
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1879519
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Patent number 1,879,519
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Issue date Sep 27, 1932
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F24 - HEATING RANGES VENTILATING
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1827540
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Patent number 1,827,540
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Issue date Oct 13, 1931
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F24 - HEATING RANGES VENTILATING
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1244613
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Patent number 1,244,613
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Issue date Oct 30, 1917
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F24 - HEATING RANGES VENTILATING