Generally speaking, this is a state-owned enterprise called State-owned 503 Factory. This enterprise seems to be set up separately. I remember that I used to sell tankers, and my office was moved from Weizikeng 503 to Changping production area (there was a shuttle bus). It depends on which one you are assigned. In the 1980 s, employees were given houses, but now it's over ... no houses.
Beijing Changkong Machinery Co., Ltd. You can look at the introduction on Baidu official website (of course, it sucks, hehe)
You can go and see it first and feel it for a year ... If you can't do it, then quit ... If you are a college student who has transferred to the household registration, you should be cautious. It's not that easy.