Zhengzhou has: Zhengzhou Machinery Research Institute, 713 CSSC, 22 and 27 China Electronics Group (major machinery),
Zhengzhou Abrasive Grinding Institute, Zhengzhou Chinalco Research Institute, Sixth Institute of Machinery, Fifth Institute of Nuclear Engineering, Zhengzhou Automation Research Institute, etc. That's about it.
If you search for the word research on Baidu map, many research institutes will also be listed.
I hope we can all go back to work in Zhengzhou!