Dr. Weber by coincidence found out about the advantages of ac-biasing in connection with tape recorders. After clarification of the theory involved with Dr. H.J. von Braunmuhl he was successful in the introduction of the new HIFI recording system in the German readiostudios. German disc-companies and filmstudios follwed already before 1945. The Weber invention became a worldwide accepted system after World War II.: The other two ac-bias inventions before 1940 did not bring out results.
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