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US3226280A
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Apparatus for producing an endless filter string
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US3179024A
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Method of and arrangement for producing crimped flat material
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US3180911A
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Method of making cigarette filter plugs of fibrous material containing thermoplastic fibers
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Filter for tobacco smoke
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Method of producing endless fibre webs having irregular surfaces
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Crimped flat material for filter plugs for cigarettes
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US2820461A
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Tobacco filter, particularly for cigarettes
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Crimped flat material for filter plugs
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Filtering material
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Machinery for producing filter strands from fibrous pulp
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