Cranes, graders, pavers, rollers, excavators, and trenching machines are among the equipment that make factories, offices, houses, schools, roads, airports, and the other "products" of the construction industry possible. For U.S.-based construction-equipment manufacturers, 1998 sales to global markets are expected to be a couple percentage points below 1997's growth marks -- but still at respectable levels, indicates the Construction Industry Manufacturers Assn., Milwaukee.