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"In 1938, S.J. Begun left Germany and joined the Brush Development Company in the United States, where work continued but attracted little attention until the late 1940s when the company released the very first consumer tape recorder in 1946: the Soundmirror BK 401.[1] Several other models were quickly released in the following years. Tapes were initially made of paper coated with magnetite powder. Minnesota Mining & Manufacturing Company (3M) replaced them by plastic tapes in 1948.[perlu rujukan]
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