When was Sina invented at the latest?

At the latest at the end of the warring States period.

Han Feizi has a degree: "Madam, ministers and so on invade their masters, and if the terrain gradually becomes accessible, people will lose their masters, and things will be easy to face without knowing. Therefore, Wang Li Sina takes the day and night first. "

"Guiguzi seeks an article": "It is also Sina's business that a husband can measure his material and infer his feelings."