1. Sesco Inc 9547 Fairfax Blvd, Fairfax, VA 22031 Coordinate: 38.86425,-77.27415 Phone: (703) 273-4477
2. Topcon Instrument Corporation Of America 5045 Dequincey Dr, Fairfax, VA 22032 Coordinate: 38.81794,-77.2866 Phone: (703) 323-9575