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Drum mixer
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Patent number 4,113,238
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Issue date Sep 12, 1978
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Georg Fischer Aktiengesellschaft
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Franz Hofmann
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B22 - CASTING POWDER METALLURGY
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3838847
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Patent number 3,838,847
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Issue date Oct 1, 1974
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B22 - CASTING POWDER METALLURGY
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3277540
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Patent number 3,277,540
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Issue date Oct 11, 1966
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B22 - CASTING POWDER METALLURGY
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2826794
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Patent number 2,826,794
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Issue date Mar 18, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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1948328
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Patent number 1,948,328
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Issue date Feb 20, 1934
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B22 - CASTING POWDER METALLURGY
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1729361
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Patent number 1,729,361
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Issue date Sep 24, 1929
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B22 - CASTING POWDER METALLURGY