Last of the true "IBM" ThinkPad

[ThinkPad560X]

What was the last true thinkPad under IBM? I'm going to say the R50 seires, T40 Seires and X40 Seires 2005. I own a T60 that has the IBM ThinkPad logo on it. Was going to buy a R60/X60 as the last "IBM" ThinkPad for my collection. As you can see I'm collecting the IBM ThinkPad and not the lenovo ThinkPad.

Heres a good site that shows every ThinkPad and its year, It shows the lenovo brand under the T/R/X60. http://www.thinkwiki.org/wiki/ThinkPad_History

I thought the full complete lenovo ThinkPad started with the T61/R61/X61

Admin edit: There are a lots of threads on this topic already, there is no need for yet another one.