1923 – EPRON-1 Humidistat – E. G. Danilenko (Russian)
1923 – EPRON-1 Humidistat – E. G. Danilenko. ГидроÑтат Даниленко Е.Г. «ÐПРОÐ-1» Source: here. Original text by Alexey Rasshivalov, translated to English by Google translate. The first domestic ( and second in the world) DHD humidistat , better known as " EPRON -1 ." Built in 1923, the project EG Danilenko . Heavy machine to …
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