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I purchased a DP-1-V roentgenmeter from 1958 in a very poor condition. Nobody wanted to buy it, and the device was already going to be scrapped. For six months I gathered my strength before I started repairing it. I did not believe in success myself. But DP-1 turned out to be a steadfast soldier!
See also my review of DP-1-V: • Обзор рентгенметра ДП-1-В