| 摘要 |
962,327. Magnetic records. TELEFUNKEN A.G. Sept. 29, 1960 [Oct. 1, 1959], No. 33437/60. Heading G5R. A magnetic record, grooved for guiding a record/playback head has depressions 2 formed near the start of the groove, the discontinuities in the permeability being converted by the action of an erase magnet into a high-pitched recorded tone detected by the playback head and used to indicate an appropriate instant for changeover to the recording mode and for starting dictation. |
