73149895
Dec 22, 1977
Oct 8, 1985
3M COMPANY
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[ ARTIFICIAL AND SYNTHETIC RESINS AND FIBERS USED IN THE MANUFACTURE OF NON-WOVEN FILTER MEDIA ]
MACHINE PARTS-NAMELY, AIR FILTERS
AIR PURIFYING APPARATUS PARTS-NAMELY, FILTER MATERIAL AND FILTERS
[ TEXTILE FILTER MATERIALS, FILTER CLOTH, FILTER TISSUES ]