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3905758
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Patent number 3,905,758
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Issue date Sep 16, 1975
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F27 - FURNACES KILNS OVENS RETORTS
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3905759
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Patent number 3,905,759
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Issue date Sep 16, 1975
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C21 - METALLURGY OF IRON
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3189338
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Issue date Jun 15, 1965
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C21 - METALLURGY OF IRON
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F27 - FURNACES KILNS OVENS RETORTS
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2620918
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Patent number 2,620,918
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Issue date Dec 9, 1952
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F27 - FURNACES KILNS OVENS RETORTS