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Regenerator flow control
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Patent number 4,088,180
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Issue date May 9, 1978
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PPG Industries, Inc.
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Yih-Wan Tsai
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F27 - FURNACES KILNS OVENS RETORTS
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Regenerator flow control
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Patent number 4,047,560
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Issue date Sep 13, 1977
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PPG Industries, Inc.
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Yih-Wan Tsai
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F27 - FURNACES KILNS OVENS RETORTS
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2813708
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Patent number 2,813,708
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Issue date Nov 19, 1957
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F28 - HEAT EXCHANGE IN GENERAL
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2768822
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Patent number 2,768,822
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Issue date Oct 30, 1956
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C21 - METALLURGY OF IRON
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2766031
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Patent number 2,766,031
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Issue date Oct 9, 1956
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F28 - HEAT EXCHANGE IN GENERAL
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2494816
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Patent number 2,494,816
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Issue date Jan 17, 1950
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C21 - METALLURGY OF IRON
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1941976
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Patent number 1,941,976
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Issue date Jan 2, 1934
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1565971
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Patent number 1,565,971
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Issue date Dec 15, 1925
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C21 - METALLURGY OF IRON
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1322208
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Patent number 1,322,208
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Issue date Nov 18, 1919
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F28 - HEAT EXCHANGE IN GENERAL
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1124870
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Patent number 1,124,870
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Issue date Jan 12, 1915
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F28 - HEAT EXCHANGE IN GENERAL