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PDF] Reference equivalent threshold levels for pure tones and 1/3-oct noise bands: insert earphone and TDH-49 earphone. | Semantic Scholar
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PDF] Reference equivalent threshold levels for pure tones and 1/3-oct noise bands: insert earphone and TDH-49 earphone. | Semantic Scholar
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Brand New Tdh39 Dd45 Audiometer Audiometric Earphone Air Conduction Transducers Headsets Hearing Tester - Ear Care - AliExpress
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