Quartz control set for P and K stations; manufactured by Zellweger, Uster.
The set installed in the cabinet of an "P set" is used to calibrate the Zellweger radios of the P and K1A series.
Quartz-controlled signal generator
The quartz control set was developed by Zellweger, Uster to calibrate the sets of the P & K1A series.
At the end of the 1940s, 20 units were procured.
I would be grateful for additional information and images to complete the website. I am also interested in purchasing a Q.E.G..