3-Point Hydraulic crane attachment?

Hello all, I am looking for the name or company that makes (if there is one and I think there is) of a 3-Point mounted crane to lift beams, small bents and such to assist in the assembly of a frame. I searched the forum and it came back with a few questions/answers, but none were actually relevant to this topic.
I think the crane sits right on the ground behind the tractor like a small backhoe, but is desgined like a extendable crane. Any ideas? Help is more than appreciated, I googled this and hit on small booms for small barnyard work. Thanks, Bob

Unless you have a large tractor with plenty of suitcase weights or other front weights I would be very wary of a rear crane attachment. I have seen some rigs that are meant for skid-steers and would attatch to your bucket mount (if it is set up for quick-attatch).

Of course there are always these cool little mini-cranes

Andy