BS 2497-4:1972

Specification for a reference zero for the calibration of pure-tone audiometers. Normal threshold of hearing for pure tones by bone conduction.

NORMA vydaná dňa 25.7.1972

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The information about the standard:

Designation standards: BS 2497-4:1972
Note: NEPLATNÁ
Publication date standards: 25.7.1972
The number of pages: 7
Approximate weight : 21 g (0.05 lbs)
Country: British technical standard
Kategória: Technické normy BS