BS 3171:1959

Characteristics & method of test of air conduction hearing aids using electronic amplification.

NORMA vydaná dňa 23.11.1959

The information about the standard:

Designation standards: BS 3171:1959
Note: NEPLATNÁ
Publication date standards: 23.11.1959
Approximate weight : 300 g (0.66 lbs)
Country: British technical standard
Kategória: Technické normy BS