《北齐书·列传·卷四十七》
开始按照旧例，在尚书省门设立签名的地方，记下每人出入早晚的情况，尚书令仆射以下的官员都得小心翼翼。
始依故事，于尚书省立门名，以记出入早晚，令仆已下皆侧目。
According to the previous practice, a receptionist was set up at the gate of the Ministry of Revenue to record the time of each person entering and leaving, and the officials below the minister and deputy minister had to be very careful.