The following system and process firsts occurred in the years from 1936 to 1944 at the instigation of the RRG (Reichs-Fundfunk-Gesellschaft-German Broadcasting Company), or its own development work, on the basis of the Magnetophon tape recorders of AEG and the magnetic tapes from the Ludwighafen works of IG Farben, today BASF: 1) 1936, "Káse" transportable, spring-driven magnetic tape recorder; 2) 1939 Magnetic tape studio recording equipment RRG R 122; 3) 1939 Transportable magnetic tape recorder RRG R 23; 4) 1940 Dramatic improvement in frequency response and dynamic range achieved by recording on magnetic tape with powdered storage coating by high frequency biasing, in accordance with German Patent DRP 743 411; 5) 1942 Magnetic tape studio recording equipment RRG R 122a with high frequency biasing of tape; 6) 1942 Magnetic tape studio recording equipment with AEG Magnetophon K 7 as transport drive mechanism and high frequency biasing of the tape, for stereophonic recording and playback; and 7) 1944 Transportable magnetic tape recorder RRG R 26 with high frequency biasing of the tape, tape speed about 18 cm/s.
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