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Professional GroupMagnetic RecordingMagnetic TapeAudio AmplifierMicrophone SensitivityFrequency ResponseAcoustical EngineeringCondenser MicrophoneMotion PicturesRecording EquipmentPatent LiteratureRoom AcousticsTape RecordingFrequency ModulationAudio Frequency Power AmplifierFrequency Selective AmplifierCathode Bias ResistorHearing AidsHearing AidNoise Level
vol.2 (1954)
vol.1 (1953)