Because Zhang Qing is a person with modern memories, he learned the mortise and tenon structure from Chu Yu.

On top of that, he made glass out of sand!

He also taught Chen Ming this, but this thing is inconvenient to transport, and the structure of the sale should be to accept apprentices, because there are no patents or anything in this era, and it is inconvenient to divide them.

Fortunately, a sum of money was collected, and it was slowly spread out, anyway, the transportation of this thing could not be solved, it could only be done in one place, and there would be a steady stream of people who came to apprentice at that time.

It's also a lot of income, but after all, the trouble hasn't been developed yet, and only the Heishui Mountain realm has this thing at present.

The two-story building built by Zhang Qing has large floor-to-ceiling windows......

"The beginning was suppressed, and I became a stand-in? Chapter 121 The dowry letter is being typed, please wait a moment,

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