Ergonomic assessment of speech communication. Speech interference level and communication distances for persons with normal hearing capacity in direct communication (SIL method).
NORMA vydána dne 15.3.1997
Designation standards: BS ISO 9921-1:1996
Note: NEPLATNÁ
Publication date standards: 15.3.1997
The number of pages: 18
Approximate weight : 54 g (0.12 lbs)
Country: British technical standard
Kategorie: Technické normy BS