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3822873
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Patent number 3,822,873
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Issue date Jul 9, 1974
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F27 - FURNACES KILNS OVENS RETORTS
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3464573
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Patent number 3,464,573
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Issue date Sep 2, 1969
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F27 - FURNACES KILNS OVENS RETORTS
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3398944
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Patent number 3,398,944
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Issue date Aug 27, 1968
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C21 - METALLURGY OF IRON
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3159021
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Patent number 3,159,021
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Issue date Dec 1, 1964
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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3121323
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Patent number 3,121,323
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Issue date Feb 18, 1964
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B22 - CASTING POWDER METALLURGY
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1399516
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Patent number 1,399,516
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Issue date Dec 6, 1921
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F27 - FURNACES KILNS OVENS RETORTS