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Sludge drier
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Patent number 5,561,917
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Issue date Oct 8, 1996
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William J. Ratajczek
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F26 - DRYING
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3619907
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Patent number 3,619,907
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Issue date Nov 16, 1971
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F26 - DRYING
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3494049
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Patent number 3,494,049
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Issue date Feb 10, 1970
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F26 - DRYING
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2978229
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Patent number 2,978,229
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Issue date Apr 4, 1961
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B08 - CLEANING
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2857684
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Patent number 2,857,684
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Issue date Oct 28, 1958
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F26 - DRYING
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2825149
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Patent number 2,825,149
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Issue date Mar 4, 1958
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F26 - DRYING
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2660807
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Patent number 2,660,807
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Issue date Dec 1, 1953
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F26 - DRYING
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2461134
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Patent number 2,461,134
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Issue date Feb 8, 1949
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F26 - DRYING
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2449278
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Patent number 2,449,278
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Issue date Sep 14, 1948
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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2412133
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Patent number 2,412,133
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Issue date Dec 3, 1946
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F26 - DRYING
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2311824
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Patent number 2,311,824
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Issue date Feb 23, 1943
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F26 - DRYING
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1890397
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Patent number 1,890,397
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Issue date Dec 6, 1932
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F26 - DRYING
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1503193
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Patent number 1,503,193
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Issue date Jul 29, 1924
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F26 - DRYING
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1338731
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Patent number 1,338,731
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Issue date May 4, 1920
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F26 - DRYING