US3516542A
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Stacked,identical filter elements
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GB938518A
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Improvements in or relating to tubular filter elements
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ES270415A1
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Improvements in the filtering elements assembly systems in hollow bodies (Machine-translation by Google Translate, not legally binding)
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GB904293A
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Improvements in or relating to devices for holding an insert member in a hollow body
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US3053395A
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Pleated-wall tubular filter and method of manufacturing same
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GB863525A
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Pleated-wall tubular filter and method of manufacturing same
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GB831430A
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Filter unit and filters equipped therewith
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US2883058A
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Filter unit and filters equipped therewith
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GB758880A
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New method of producing tubes or sleeves of cloth and appliance for carrying out said method
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