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A machinist is in an environment where the ambient sound level is of 85 dB, i., corresponding to the 8 Hours/day noise level.

A machinist is in an environment where the ambient sound level is of 85 dB, i.e., corresponding to the 8 Hours/day noise level. The machinist likes to listen to music, and plays a Boom Box at an average level of 88.0 dB.

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