The following are manufacturers
of sound measuring and analyzing equipment.
Bruel & Kjaer
(Denmark)
Larson Davis (USA)
Quest Technologies (USA)
Casella (England)
Rion (Japan)
Norsonic (Norway)
Cirrus Research (England)
Ono Sokki (Japan)
CESVA (Spain)
01dB-Metravib (France)
Svantek (Poland)