US2954783A
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Filter type tobacco smoking structure for removal of tar
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US2954785A
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Device for removal of tar and other deleterious substances from tobacco smoke
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US2954774A
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Tobacco tar removal structure
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US2954784A
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Device for removal of tar and other deleterious substances from tobacco smoke
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US3010458A
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Device for removal of tar and other deleterious substances from tobacco smoke
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US2954782A
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Cigarette filter structure
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US2954787A
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Filter for smokable articles
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US2954781A
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Device for removal of tar and other deleterious substances from tobacco smoke
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US2954773A
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Cigarette filters and method of making same
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US2954777A
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Device for removal of tar and other deleterious substances from tobacco smoke
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US2954780A
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Device for removal of tar and other deleterious substances from tobacco smoke
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US2954779A
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Device for removal of tar and other deleterious substances from tobacco smoke
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US2954772A
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Removal of tar and other deleterious substances from tobacco smoke
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US2954778A
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Auxiliary filtration means for filter-type cigarettes
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