Donaldson Filter Invention of the world’s first Air Cleaner in 1915. Possession over 1,000 engineers and over 1,600 patents worldwide. 35 factories, 125 laboratories, 15 distribution centers in 44 countries. A wide range of products of oil, fuel, air, hydraulic filters, etc. OEM Partnership with outstanding Makers. Quality Certified ISO9001, TS16949, AS9100