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    Determining that average to be about 48 decibels, Groll then went to a quarry to measure the noise generated by a rock crusher operating a distance

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    Determining that average to be about 48 decibels, Groll then went to a quarry to measure the noise generated by a rock crusher operating a distance of about 100 yards away — which he estimated

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  • Snapshot of Noise and Worker Exposures in Sand and Gravel

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  • cement plants rock crushers YouTube

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