Yuri Blanarovich wrote:

If I remember right, diathermy operated around 11m. I remember
hearing them when I was in high school.

Was there problem or any negative effects from diathermy?

Back when I had a particularly nasty sinus infection while I was an
undergraduate, I got my frontal sinuses diathermied to loosen the
guck in the sinuses. Worked a treat, and I haven't noticed any ill
effects -- except the green tentacles at the corners of my mouth.

--
Most people aren't thought about after they're gone. "I wonder where
Bob got the plutonium" is better than most get.
-- Robert Uhl, in rec.org.sca