Updated Y-4 with torsion-bar suspension, and bumped timeframe 2 years.
Also, here's the YL-6 Light tank, introduced 1935 with a 35mm gun.
The YL-6 was one of the most successful light tanks built by Cenet, even serving on alongside it's replacement, the YL-7. First introduced int 1935, the YL-6 was used extensively in conjunction with the Japanese Type 95 Ha-Go in China and throughout the Pacific. Nicknamed "The Beetle" by her 3 man crews, the YL-6 was slightly tempermental at times but could handle almost all terrain, albeit somewhat slowly.
"If people never did silly things nothing intelligent would ever get done." ~Ludwig Wittgenstein