 The company's first public safety customers (all in the U.S. state of Illinois) included the Village of River Forest, Village of Bellwood Police Department, City of Evanston Police, Illinois State Highway Police, and Cook County (Chicago area) Police with a one-way radio communication.In the same year, the company built its research and development program with Dan Noble, a pioneer in FM radio and semiconductor technologies, who joined the company as director of research.The company produced the hand-held AM SCR-536 radio during World War II, which was vital to Allied communication.