Why sadistic? I knew it right away! (I am Dutch *g*)
Finally I had a chance to know one and beat everything to it, you spoil it ;-)
I have one or two crude books (late seventies, begin eigthies) which are a treasury about Dutch aviation. The series is called 'De Nederlandse luchtvaartencyclopedie' (The Dutch aviation encyclopedia). I believe in the book describing the T-V the T-IX is mentioned as well. I don't remeber exactly but I believe it was a one-off and the first all metal Fokker aeroplane.