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Melting furnace
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Patent number 4,259,539
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Issue date Mar 31, 1981
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Korf-Stahl AG.
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Emil A. Elsner
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F27 - FURNACES KILNS OVENS RETORTS
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Electrode for arc furnaces
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Patent number 4,256,918
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Issue date Mar 17, 1981
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Korf-Stahl AG.
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William E. Schwabe
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Tiltable arc furnace
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Patent number 4,170,712
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Issue date Oct 9, 1979
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Korf-Stahl AG.
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Emil Elsner
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H01 - BASIC ELECTRIC ELEMENTS
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Melting furnace
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Patent number 4,119,792
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Issue date Oct 10, 1978
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Korf-Stahl AG.
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Emil A. Elsner
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F27 - FURNACES KILNS OVENS RETORTS