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Balanced flow tobacco smoke filter
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Patent number 5,195,543
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Issue date Mar 23, 1993
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American Filtrona Corporation
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Richard M. Berger
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A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES
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Ultra-high filtration filter
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Patent number 4,869,275
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Issue date Sep 26, 1989
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American Filtrona Corporation
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Richard M. Berger
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Fiber separator
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Patent number 4,747,814
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Issue date May 31, 1988
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American Filtrona Corporation
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Richard M. Berger
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A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES
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Filter manufacturing technique
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Patent number 4,507,107
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Issue date Mar 26, 1985
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American Filtrona Corporation
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Richard M. Berger
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D04 - BRAIDING LACE-MAKING KNITTING TRIMMINGS NON-WOVEN FABRICS