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AP Photo/Koji Sasahara
Sony's NTC-60 digital tape cassette for Scoopman digital micro recorder, listed as the smallest in the Guinness Book of World Records in 1992, measured only 21.5x30x5 millimeters (7/8 x1 3/16×3/16 inches), but could record and play back 90 minutes of clear digital sound, shown Aug. 21, 1992 in Tokyo.