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Method of reverse stratification
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Patent number 4,240,903
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Issue date Dec 23, 1980
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Vish Minno Geoloshki Institute
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Stoycho M. Stoev
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B07 - SEPARATING SOLIDS FROM SOLIDS SORTING
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Vibro-acoustical extraction apparatus
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Patent number 4,184,965
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Issue date Jan 22, 1980
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Vish Minno-Geoloshki Institute-Nis
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Stoycho M. Stoev
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Apparatus for mineral processing
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Patent number 4,109,874
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Issue date Aug 29, 1978
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Vish Minno-Geloshki Institute-Nis Darvenitza
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Stoycho M. Stoev
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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