[国外标准] SAE J1174-1985 OPERATOR EAR SOUND LEVEL MEASUREMENT PROCEDURE FOR SMALL ENGINE POWERED EQUIPMENT
[国外标准] SAE J1160-1983 OPERATOR EAR SOUND LEVEL MEASUREMENT PROCEDURE FOR SNOW VEHICLES
[国外标准] JIS T8161-1983 Ear protectors
[国外标准] JIS T4207-2005 Infrared ear thermometers