[ Predrag Supurovic @ 20.03.2015. 10:02 ] @
12083.3 KHz, 44966.6 KHz
12085.4 KHz, 44975.0 KHz
12088.5 KHz, 44987.5 KHz
12099.0 KHz, 45029.2 KHz
[ RoRa @ 21.03.2015. 09:16 ] @
http://www.pupin.rs/proizvodi-i-usluge/piezotehnologija/

Nadam se da nisu zaboravili kako se bruse kristali.