History: Russian experimental infra-red night vision goggles for a BT tank driver. "дудка" 1939 [1101x816]

http://i.imgur.com/9ThePtP.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/cixqw2/russian_experimental_infrared_night_vision/?utm_source=ifttt