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3836103
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Patent number 3,836,103
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Issue date Sep 17, 1974
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F27 - FURNACES KILNS OVENS RETORTS
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3711075
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Patent number 3,711,075
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Issue date Jan 16, 1973
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F27 - FURNACES KILNS OVENS RETORTS
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3648992
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Patent number 3,648,992
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Issue date Mar 14, 1972
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F27 - FURNACES KILNS OVENS RETORTS
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2980413
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Patent number 2,980,413
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Issue date Apr 18, 1961
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F27 - FURNACES KILNS OVENS RETORTS
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2432996
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Patent number 2,432,996
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Issue date Dec 23, 1947
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F27 - FURNACES KILNS OVENS RETORTS
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2399189
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Patent number 2,399,189
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Issue date Apr 30, 1946
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F26 - DRYING
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2269700
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Patent number 2,269,700
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Issue date Jan 13, 1942
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F27 - FURNACES KILNS OVENS RETORTS
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2072219
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Patent number 2,072,219
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Issue date Mar 2, 1937
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F27 - FURNACES KILNS OVENS RETORTS