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US3830403A
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Dynamic proportional metering device for fluids
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FR2148726A5
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Cylindrical filter element - with spaced,coaxial spirals of filter material,esp for air cleaners
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FR1476806A
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Filter with conical or frustoconical element in filter cloth or filter sheet
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FR87671E
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Inspection and access door for pressure vessels
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FR1409910A
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Clogging indicator for filters
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FR1403894A
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Inspection and access door for pressure vessels
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FR1403833A
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pleated filter elements
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FR1392600A
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Plant for the filtration of liquids containing suspended solid particles
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FR1356375A
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Improvements to liquid filters
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