 At first Arco was responsible as a laboratory engineer for testing various electrical cable types, but also, through continued contact with Slaby, introduced and developed wireless telegraphy at AEG.Patent disputes between Siemens and AEG resulted in both companies, at the behest of William II, German Emperor, founding a common enterprise, the Society for Wireless Telegraphy Ltd.The company's telegraphic address, Telefunken, eventually became the company name.