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NO LONGER HEAR" is specifically designed for the railway workers, when a rail is strucked
by a hammer ,its vibration transfers and hammer vibration frequency is changing, which is
used to determine whether the sound changes in order to determine whether there is a problem.
When hammer vibration is abnormal, hammer's warning light starts flashingand reminds the
railway workers. The design greatly improves the detection efficiency and accuracy of the
workers, to protect the safety rail and passengers by simply changing the hammer.
Dalian Nationalities University