GB/T 7342-1987

IEC provisional reference coupler for the calibration of earphones used in audiometry

NORMA vydaná dňa 28.2.1987

The information about the standard:

Designation standards: GB/T 7342-1987
Note: NEPLATNÁ
Publication date standards: 28.2.1987
Country: Chinese technical standard
Kategória: Technické normy GB