Hi. There are a lot of short (10 - 60 min) japanese films on IJA and IJN technology available on the National Film Archive of Japan youtube chanel. Most are from 1930 - 1935 showing weapons and tools like the Type 90 24 cm railway gun, the Type 90 7,5 cm Field Gun, the Type 91 Heavy Tank, a gasoline driven chainsaw, a track building train and much, much more rare things in action. (1) 国立映画アーカイブ National Film Archive of Japan - YouTube Yours tom!
