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Induction crucible furnace
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Patent number 4,227,033
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Issue date Oct 7, 1980
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Institute po Metaloznanie i Technologia na Metalite
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Ivan D. Nikolov
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F27 - FURNACES KILNS OVENS RETORTS
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3303259
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Patent number 3,303,259
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Issue date Feb 7, 1967
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C21 - METALLURGY OF IRON
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3303258
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Patent number 3,303,258
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Issue date Feb 7, 1967
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C21 - METALLURGY OF IRON
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3300564
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Patent number 3,300,564
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Issue date Jan 24, 1967
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C21 - METALLURGY OF IRON
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3300565
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Patent number 3,300,565
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Issue date Jan 24, 1967
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C21 - METALLURGY OF IRON