Radio . Gustaf Dalén realized the possibility of using radio as a navigational aid at an early stage. AGA’s first experiments with radio transmissions from aircraft were carried out in 1915 and 1916, when experiments were also made with direction finders to determine the direction to these airborne radio transmitters. In 1919 AGA, Asea and LM Ericsson formed Svenska Radio AB to concentrate Swedish research and development within radio technology. The majority of AGA's radio technicians moved to the new company. When broadcast transmissions started in 1924, AGA revived its old radio department and started manufacturing crystal sets. Gustaf Dalén was also interested in valve receivers and produced ideas and suggestions for new valvea designs. As a result AGA was able to present the first mains-powered radio receiver in Europe with an built-in loudspeaker in 1927. AGA acquired Baltic Radio AB in 1928 and the company merged with AGA's radio department to form Aga-Baltic AB. The company was made responsible for development and sales of radios, other home electronics, sound film equipment and radio navigation systems until 1946 when it was incorporated with the parent company.