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The concept of tracks isn't technically complex, and practically any industrialized country could manufacture something similar once they understood the principle.
The technology involved isn't advanced because everyone had produced chain transmissions or similar devices before; just enlarge and reinforce them, and you pretty much have the prototype of a track.
After Gobur had shown off his tanks, Tang Mo no longer felt it necessary to keep his tank troops a secret.
Previously, tank production on Dragon Island was extremely time-consuming and strenuous. Transporting the tanks by ship had been as troublesome as if the Great Tang Kingdom's military were always conducting amphibious landings.
Now, things were better. Tang Mo could proudly produce his own tanks near Tongcheng, substantially reducing the transportation costs.