Siheyuan: Appointed as Workshop Director, Modified J-7

He Yuchen, an eighth-level fitter, traveled to a world full of love in the courtyard and became He Yuzhu's younger brother. With his superb skills, he became the workshop director of the steel rolling mill. Ding, congratulations to the host for opening the god-level technology system The golden finger was turned on, and he accidentally changed the J-7 blueprint. From then on it was out of control. While fighting against the "animals" of the courtyard, he began to reform industrial technology. When others are still collecting antiques and calculating to make a few extra cents. He Yuchen has quietly begun to contribute to the future science and technology of the motherland. Medals of honor line the walls. Aircraft, tanks, battleships, missiles, satellites, aircraft carriers, submarines... A series of magic modifications that surpass the technology of this era. When everyone starts to realize. China is like a giant dragon soaring, rising in the forest of the world. The world will also remember a name. He Yuchen! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.