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Production of sand moulds
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Patent number 4,286,937
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Issue date Sep 1, 1981
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Alfelder Maschinen- und Modell-Fabrik Kunkel, Wagner & Co. KG
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Walter Ahrens
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B22 - CASTING POWDER METALLURGY
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3744549
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Patent number 3,744,549
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Issue date Jul 10, 1973
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B22 - CASTING POWDER METALLURGY
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3556196
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Patent number 3,556,196
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Issue date Jan 19, 1971
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B22 - CASTING POWDER METALLURGY
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3293703
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Patent number 3,293,703
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Issue date Dec 27, 1966
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B22 - CASTING POWDER METALLURGY
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2933785
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Patent number 2,933,785
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Issue date Apr 26, 1960
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B22 - CASTING POWDER METALLURGY
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2563643
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Patent number 2,563,643
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Issue date Aug 7, 1951
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B22 - CASTING POWDER METALLURGY
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1939585
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Patent number 1,939,585
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Issue date Dec 12, 1933
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B22 - CASTING POWDER METALLURGY
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18926
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Patent number 18,926
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Issue date Dec 22, 1857
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B22 - CASTING POWDER METALLURGY