What do these contacts do? 
Most contacts are CAD software users, such as Civil Designers/Drafters, Architects, Industrial Engineers, etc. The list also includes CAD influencers, such as MIS, who work with the regular users, and decision makers, such as Engineering & Technology Managers, Vice Presidents, etc.

All types of Architectural Engineering & Construction, Civil engineering/design & GIS, such as Agriculture, Electric & GAS Utility, Cartography, Environmental, GPS, Mapping,.....create drawings for roadway plans, profiles and sections, pipe runs, and grading schemes,  architecture for residential, commercial building , HVAC, Plumbing, Piping, and Electric.