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David Clark Headsets H9940 Use and care information (2 pages)
19538P-67 (11-08) 2008 David Clark Company Incorporated USE AND CARE INFORMATION The effectiveness of a hearing protector in reducing noise is known as its "attenuation". Attenuation is measured in decibels (dB). Federal law requires a standardized method of measuring and summarizing a hearing protector's noise attenuation, kn …
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