SMTnet Express, May 11, 2017, Subscribers: 30,455, Companies: 10,596, Users: 23,229 Privacy Threats through Ultrasonic Side Channels on Mobile Devices Daniel Arp, Erwin Quiring, Christian Wressnegger and Konrad Rieck; Technical University
| http://www.thebranfordgroup.com/dnn3/Auctions/PastSales/tabid/58/Default.aspx
& Dukane Ultrasonic Welders [Online] SOLD - Auction Closed on 12/8/2022 Final Sale of the Year! Surplus to Major Health & Safety Manufacturer 2,500-Watt & 4,000-Watt Ultrasonic Welders All Equipment New in 2020! Tempe, AZ -- Watertown, MA TRC Circuits
