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Dust filter bag
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Patent number 6,193,773
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Issue date Feb 27, 2001
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Firma Carl Freudenberg
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Ulrich Schlör
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A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
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Filter insert
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Patent number 5,958,097
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Issue date Sep 28, 1999
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Firma Carl Freudenberg
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Ulrich Schlor
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Method for manufacturing a filter insert
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Patent number 5,863,482
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Issue date Jan 26, 1999
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Firma Carl Freudenberg
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Ulrich Schlor
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Flexible folded filter insert
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Patent number 5,779,747
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Issue date Jul 14, 1998
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Firma Carl Freudenberg
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Ulrich Schlor
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Filter pack
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Patent number 4,728,426
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Issue date Mar 1, 1988
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Kernforschungszentrum Karlsruhe GmbH
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Volker Rudinger
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL