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Ceramic foam filter
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Patent number 4,975,191
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Issue date Dec 4, 1990
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Swiss Aluminium Ltd.
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Jerry W. Brockmeyer
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B22 - CASTING POWDER METALLURGY
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Filtering of molten metal
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Patent number 4,081,371
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Issue date Mar 28, 1978
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Swiss Aluminium Ltd.
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John C. Yarwood
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B22 - CASTING POWDER METALLURGY
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Filtering of molten metal
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Patent number 4,024,056
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Issue date May 17, 1977
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Swiss Aluminium Ltd.
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John C. Yarwood
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B22 - CASTING POWDER METALLURGY
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Ceramic foam filter
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Patent number 3,962,081
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Issue date Jun 8, 1976
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Swiss Aluminium Ltd.
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John C. Yarwood
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B22 - CASTING POWDER METALLURGY