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2570082
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Patent number 2,570,082
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Issue date Oct 2, 1951
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F26 - DRYING
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2551774
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Patent number 2,551,774
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F27 - FURNACES KILNS OVENS RETORTS
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Patent number 2,132,321
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F27 - FURNACES KILNS OVENS RETORTS
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Patent number 1,547,648
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Issue date Jul 28, 1925
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F27 - FURNACES KILNS OVENS RETORTS