Hearing protection devices (HPDs), used to guard the human ear against incurring hearing loss due to noise, have been in existence at least since the early 1900s even though their use in United States (U.S.) workplaces was not regulated by law until 1971. In fact, in...
CITATION STYLE
Casali, J. G. (2012). Hearing Protection Devices: Regulation, Current Trends, and Emerging Technologies (pp. 257–283). https://doi.org/10.1007/978-1-4419-9523-0_12
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