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At the turn of the century, the two leading electrical companies in the German Empire each had their own laboratories for researching spark telegraphy for wireless message transmission. One group, led by Adolf Slaby and Georg Graf von Arco, developed at AEG for the Imperial Navy, the other under Karl Ferdinand Braun at Siemens & Halske for the German Army. They were in international competition with various companies led by Guglielmo Marconi. #telefunken #cb-funk #hamradio #amateurfunk #cbfunk #antenne #broadcasting #history #radio #fernsehen #deutschland #nauen #thales #tompson #siemens #aeg