It is a TD 9, and forsure a custom built steel pipe bender. my dad used those in the old days to custom bend pipe to fit the trench before it went in.
that one just looks home made. Thats whmy its got the arched piece that runs through the bottom side of the cat, and the hydraulic cylenders at the back to pry the pipe against the bottom side of the machine until it bends .
It is used on tree farms it is used to prune the roots on trees and bushes. The roller up front is used to push the trees down as to not damage them, the pipes on the outside of the track frames is to mount shields on so as the tracks do not damage the other rows. A few years ago We built a high crop tractor for a nursery to use it in small bushes, same aplication just not as much drawbar pull needed.....
gertrude .... or gertie for short.... that's her name "gertie"