BS-6950 › Specification for a standard reference zero for the calibration of pure tone bone conduction audiometers
Specification for a standard reference zero for the calibration of pure tone bone conduction audiometers
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17.020 (Metrology and measurement in general Including measuring instruments in general, preferred numbers, standard measures, general aspects of reference materials, etc. Quantities and units, see 01.060 Chemical reference materials, see 71.040.30)
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Feb. 29, 1988