Acoplador provisional de referencia para la calibración de auriculares utilizados en audiometría.
IEC PROVISIONAL REFERENCE COUPLER FOR THE CALIBRATION OF EARPHONES USED IN AUDIOMETRY
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13.140 / Noise with respect to human beings
17.140.50 / Electroacoustics
CTN 209/SC 29 - Electroacoustics
IEC TR 60303:1970 (Identical)
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