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Metal microfilter
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Patent number 4,812,236
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Issue date Mar 14, 1989
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Sulzer Brothers Limited
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Christian Ehrsam
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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3581893
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Patent number 3,581,893
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Issue date Jun 1, 1971
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2982412
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Patent number 2,982,412
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Issue date May 2, 1961
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1778596
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Patent number 1,778,596
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Issue date Oct 14, 1930
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL