This is the Chinese parent company with subsidiary in Germany:
https://www.inovance.eu/industries/cnc-machine-tools
And this is the notice about them acquiring Powerautomation, the German company that designed and manufactured those controllers:
https://www.inovance.eu/news/details/inovance-technology-eur...
PA was a fantastic company but like many such specialist producers they didn't have a clear succession path laid out so they eventually got sold.
https://books.industrialpress.com/9780831136369/the-cnc-hand...
Also, the materials science and engineering handbook. It's floating around on the web in PDF form if you just want to skim it but if you really need it you should probably buy a copy (warning: huge book):
https://www.amazon.com/Materials-Science-Engineering-Handboo...