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Normal equal-loudness contours for pure tones and normal threshold of hearing under free-field listening conditions.
STANDARD published on 19.5.1961
Designation standards: BS 3383:1961
Note: WITHDRAWN
Publication date standards: 19.5.1961
SKU: NS-64278
Approximate weight : 300 g (0.66 lbs)
Country: British technical standard
Category: Technical standards BS
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