https://www.treasurechestgroup.com/products/fiote-i1fiore-if08
FIOTE I1Fiore IF08
fiote
https://www.texmate.com/module/IF08%20(45-55Hz)
IF08 (45-55Hz) Input Module for TL-Frequency | Texmate
IF08 (45-55Hz) input module. Line Frequency, 45-55Hz (TL Series). Made in USA by Texmate since 1976.
input moduletlfrequencytexmate