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Kiln construction
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Patent number 4,659,356
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Issue date Apr 21, 1987
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PPG Industries, Inc.
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Robert A. Lawhon
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F27 - FURNACES KILNS OVENS RETORTS
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3584850
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Patent number 3,584,850
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Issue date Jun 15, 1971
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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3436061
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Patent number 3,436,061
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Issue date Apr 1, 1969
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F27 - FURNACES KILNS OVENS RETORTS
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3175815
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Patent number 3,175,815
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Issue date Mar 30, 1965
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F26 - DRYING
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3169016
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Patent number 3,169,016
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Issue date Feb 9, 1965
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F26 - DRYING
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3036822
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Patent number 3,036,822
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Issue date May 29, 1962
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F27 - FURNACES KILNS OVENS RETORTS
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2653809
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Patent number 2,653,809
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Issue date Sep 29, 1953
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F27 - FURNACES KILNS OVENS RETORTS
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2410235
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Patent number 2,410,235
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Issue date Oct 29, 1946
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F27 - FURNACES KILNS OVENS RETORTS
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2410236
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Patent number 2,410,236
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Issue date Oct 29, 1946
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F27 - FURNACES KILNS OVENS RETORTS
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2049734
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Patent number 2,049,734
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Issue date Aug 4, 1936
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F27 - FURNACES KILNS OVENS RETORTS
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1766453
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Patent number 1,766,453
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Issue date Jun 24, 1930
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F27 - FURNACES KILNS OVENS RETORTS
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1358760
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Patent number 1,358,760
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Issue date Nov 16, 1920
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F27 - FURNACES KILNS OVENS RETORTS