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. 2020 Mar 18;13(6):1377. doi: 10.3390/ma13061377

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© 2020 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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Important advancements made in machining technology. (a) Thermal-assisted machining [46]; (b) cryogenic machining [47]; (c) schematic diagram to illustrate the mechanism of vibration-assisted machining [48].