1. Technetronics 1417 Knecht Ave, Halethorpe, MD 21227 Coordinate: 39.25962,-76.68496 Phone: (410) 242-6191
2. Entry Master Systems 3710 Commerce Dr Ste 1001, Halethorpe, MD 21227 Coordinate: 39.25006,-76.67382 Phone: (410) 204-4445