Donaldson sells a broad line of filters and housings for industrial hydraulic and  lubricating fluids. Products are sold through  an extensive network of industrial distributors. END-MARKETS PRODUCT FAMILIES 2001 REVENUE REPRESENTATIVE CUSTOMERS OFF-ROAD EQUIPMENT Products sold to industrial equipment and defense con- tractor OEMs for agriculture, construction, mining, military and other industrial applications. TRUCKS Products sold to manufacturers of medium- and heavy-duty trucks. AFTERMARKET Broad line of replacement  filters and hard parts for all  of the equipment applications noted at left. Caterpillar, John Deere, Komatsu, CNH, Volvo Construction Equipment, General Dynamics and Stewart & Stevenson Freightliner, PACCAR,  Volvo, Scania, International  and Mitsubishi Original equipment dealers (such as Freightliner dealers  or Caterpillar dealers),  independent distributors  and private label accounts $ 182 MILLION $ 80 MILLION $ 345 MILLION Engine Intake Air  Filtration Systems Exhaust Systems Hydraulic Filtration  Systems Lube, Fuel and  Coolant Filtration Systems Cabin Air Filters 7 ENGINE PRODUCTS  Operating Segment $^{2001 Revenue}$$ 607 MILLION