《魏书·列传·卷十二》
国家西到长安，束到即墨，制造兵器镜甲，一定尽力坚硬精锐，日夜不停，到现在几年了。
国家西至长安，东尽即墨，营造器甲，必尽坚精，昼夜不息者，于兹数载。
The state extends from Chang'an in the west to Jimo in the east, manufacturing weapons, mirrors and armor, and will certainly devote all its efforts to making them as strong and sharp as possible, day and night, for several years now.