Noise levels were measured by means of the following equipments: Bru¨ el and Kjaer Mediator 2238 and Bru¨ el and Kjaer Investigator 2260, both type 1 integrating and logging sound level meters
Noise levels were measured by means of the following equipments: Bru¨ el andKjaer Mediator 2238 and Bru¨ el and Kjaer Investigator 2260, both type 1 integratingand logging sound level meters