Building Industry In Old Times Chapter 171

The appearance of cotton cloth surprised Roman Lu.

This is a piece of pure white cloth.

Roman Lu originally thought that at least he had to make a steam engine and change the power source from manual to steam before the system would recognize his sign-in.

But now it seems that the system restrictions are not that high, or they have become more relaxed.

I just don’t know if the reward items will have higher technological content after the power source changes.