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. 2018 Mar 4;18(3):779. doi: 10.3390/s18030779

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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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Structural diagram of the GMS ultrasonic actuator. (1) Plug seat; (2) Rear cover; (3) Screw; (4) Nut; (5) Pre-tension screws; (6) Cylindrical steel mass; (7) Backing gasket; (8) GMS rod; (9) Magnetic exciting coil; (10) Outer cover; (11) Energy-focusing head; (12) Wire to drive the circuit.