And a work environment that is noisy, 87-91 dB (A) examinations of competency hearing impaired with a duration of 4 months to 20 working years finds that there is a hearing loss to 74 percent.
And work environment noisy 87-118 dB (A) the results of hearing rehabilitation of workers with a duration of 4 months to 20 years were found to have a hearing loss of 74 percent.
And the working environment with noise 87-118 dB (A). Diagnosis of hearing ability in workers of the work 4 months to 20 years found that hearing loss were 74.