In-line diaphragm seal drawing translation form german

[Vankozz]

Hi everyone,

I have some drawings of In-line diaphragm seal in german that I need to translate in english.
However there is a treatment/processing on the drawing that I don't know what it means, it's : "Weiterbearbeitung nach T200/26/60"
Which means "Further processing according to T200/26/60".
I don't know what T200/26/60 means.

If someone have any clue it would be very helpful.

See drawings below if it can help

 

[LittleInch]

No idea I'm afraid other than some sort of internal specification.

I don't really know what this thing is or why you only have a drawing that is 30 years old....

Any more background that would help us?