filters for the purification of air, gases or fluids as parts of motors, engines, and machines; filter systems comprising filter housing and replaceable filter elements as parts of machines, motors, and engines; filter elements for filters and filter systems as parts of motors, engines and machines all used for mechanical purposes, namely, filter elements for fuel filters, in-line fuel filters, in-tank fuel filters, oil filters, gear oil filters, urea filters, filters for hydraulic fluids, fi...