Up ……… PL
These are germanium diodes from some trial series. The measurement results indicate that they are layered diodes. I could not find any further data on these elements. In the 1980s, they were to be disposed of, and the rooms were cleaned before renovation. But they were saved. It is very possible that PEWA produced them. In a similar housing I found photos of the first silicon diodes. All exhibits are marked with brown + green colors on the case back, no other markings.
