L-3 Klein Associates, a leading developer of sensor, sonar and navigation systems, has created products that aided in the search for the Titanic, Space Shuttle Challenger and TWA Flight 800. The companys product base includes the Integrated Intrusion Detection System, which features sonar, radar and other specialized sensors to provide protection for harbors, ports and anchored vessels worldwide. These systems have been deployed to both domestic and international ports and are marketed to the growing homeland security market. The company s clients include engineering companies, hydrographic surveyors, pipeline companies, oil companies, archaeologists, port authorities, universities and the United States Navy. Founded in 1968, the company maintains its 30,000-square-foot headquarters in Salem, N.H.