42 Engineering, design and development of aerial lifts, mechanical and hydraulic lifts, lifting work platforms, lifting and hoisting apparatus, hydraulically operated boom lifts for vehicles, mechanical personnel lifts, telescope lifts, articulated lifts, vertical mast lifts, scissor lifts, and compact lifts; Engineering, design and development of trucks, pickup trucks, vans, vehicles, and trailers incorporating aerial lifts, mechanical and hydraulic lifts, lifting work platforms, lifting or hoisting apparatuses, and hydraulically operated boom lifts; Engineering, design and development of trucks, pickup trucks, vans, vehicles, and trailers incorporating specialized equipment; Product inspection and testing of aerial lifts, mechanical and hydraulic lifts, lifting work platforms, lifting and hoisting apparatus, mechanical personnel lifts, telescope lifts, articulated lifts, vertical mast lifts, scissor lifts, compact lifts, and hydraulically operated boom lifts for vehicles; Product inspection and testing of trucks, pickup trucks, vans, vehicles, and trailers incorporating mechanical and hydraulic lifts, lifting work platforms, lifting or hoisting apparatuses, and hydraulically operated boom lifts for vehicle; Product inspection and testing of trucks, pickup trucks, vans, vehicles, and trailers incorporating specialized equipment