L-3 Communications-Klein Associates 11 Klein Dr, Salem, NH03079 Marty Klein started his business L-3 Communications in 1968. It provides high-resolution sonar systems, marine…More navigation systems and waterside security and surveillance systems. These systems have been used by governments, navies, port authority, surveyors, oil companies and universities. They have helped to locate the lost Titanic, U.S. Space Shuttle and downed aircraft. His employees are local and have been with him for years providing a much used and needed product.