Industrial Backbone: from Huangyadong to Tokyo Bay

[Time Travel] + [Overhead] + [Military Industry] + [Technical Flow] + [History and Military] Shen Lie, a double doctor from the National University of Defense Technology, accidentally exploded during a test firing of an armor-piercing projectile. He carried a mobile toolbox - a 3D printer and 100,000 cutting-edge technical files, and traveled through the war-torn Qigen Village in 1937. Faced with the fall of the mountains and rivers and the raging enemy troops, he declined the offer of a high-ranking official in the Shanxi-Sui Army and resolutely defected to the ragged Eighth Route Army. With modern military industry skills, they magically improved firearms, smelted special steel with local methods, purified penicillin, and made homemade high explosives. Starting from the Huangyadong cave factory, we built the Taihang military industry network, forged steel blades with advanced industrial fire, and supported the backbone of the national war of resistance with hard core strength!