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. 2018 Jul 19;18(7):2351. doi: 10.3390/s18072351

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The results for various frequencies of sine waves obtained by the sensor. The horizontal axis represents the sound pressure levels obtained with the MI 6201 MULTINORM sound meter.