The workers in the various sections of lock factories were
exposed to noise for 8-10 hours per day with half to one
hour break in between. The subjects were exposed to
maximum intensity of noise in power press unit followed
by lathe machine, grinder unit and hand press unit. Table
no II depicts that as the noise level in different sections of
lock factories increases, percentage of noise induced hearing
loss and average hearing loss increases. This finding
is consistent with the study made by Willett K.M