In this feudal era when communication was extremely low and science and technology was highly backward, the standard for the people to accept anything was to see how the royal family treated it.

If even the emperor is using your things, and he doesn't say anything, the people will naturally think that your things must be the best in the world, more useful than any advertisement.

"What do you mean? Do you have your three-sided toothbrush in the eyes of the royal family? Know where the three-sided toothbrush is? This is an old man......

"This Traverser is a Little Fierce" Chapter 91 Chapter 91 The princess is also Her Royal Highness is hitting in the hand, please wait a moment,

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