| http://www.w3.org/ns/prov#value | - Later on, the possible harmful impact of ultrasonic noise on hearing was also studied by Pawlaczyk-Luszczynska et al. [46] The results of standard pure-tone audiometry were collected from 25 workers, mainly females, aged 23-58 years, exposed for 2-13 years to ultrasonic noise emitted by ultrasonic welders.
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