Talk:Ultrasonic/sonic driller/corer

Frequencies
I believe a note on the frequency range used should be included. Articles on ultrasonic welding and cleaning include these numbers. A cursory search online suggests that the frequency is equal to or above 20 kHz, but I am unable to confirm.72.84.133.167 (talk) 17:40, 9 September 2014 (UTC)

Agreed - an entire article on an 'ultrasonic' drill with zero mention of frequency, completely useless. — Preceding unsigned comment added by 148.252.128.232 (talk) 14:27, 24 May 2020 (UTC)

History
I think this patent should be mentioned (filed April 20, 1955): https://www.google.com/patents/US3086288 87.14.175.104 (talk) 18:04, 29 November 2016 (UTC)