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Coordinated Program for Use of Recording
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AIR-PRESSURE WAVES applications AUDIO AMPLIFIER Builds Auditorium broadcast central sound system Central Sound Turntable classroom coils designed Disc-type recordings dual-speed electric currents electro-magnet embossing equipment for school erase film input signal instantaneous record jack to permit library of recordings lines of magnetic loops LOUDSPEAKER magnetic fields magnetic force magnetic material magnetic recording magnetic tape MAGNETIC WIRE RECORDING Mechanical Recording microphone north magnetic pole output signal paper or plastic performance photographic method pickup plastic tape playback activities playback equipment playing head pole pieces Portable Player portable transcription player purchaser Radio Manufacturers Record School recorded material recorded program recording and playback recording and reproducing recording currents RECORDING DISC recording head recording medium recording stylus recording wire revolutions per minute sound groove sound pattern sound recording south magnetic pole speech student operators Studio teacher tion type of disc type of recording U. S. Office wire or tape York