Classical Vinyl - Telefunken label - can anyone educate me here?

Doing some homework on Decca classical music on vinyl, and finding a bunch of recordings where the label has Decca, Teldec and Telefunken on it. Not sure if music was mastered by? Pressed by? I am good on the Decca side re: SXL versions and made in England, presses moved to Holland in 1980? or so, the London label, Angel...

Very confused with the Telefunken stuff. I know they made great tubes - I have one of there 12AX7's - VERY nice.

Thanks for any help.