Time relay `` Don-103 ''.

Time relays, timersThe time relay "Don-103" has been produced presumably since 1983 by one of the Rostov factories (P / Y). Time relay "Don-103" is designed to turn on the lamp of the photographic enlarger "Don-103" or any other for a predetermined exposure time of photographic paper, from 0.1 to 99.9 seconds.