I've seen some videos for these French diggers both tracked and wheeled strange boom design but I guess they are almost more of a "toolcarrier" and made to work in some of the most confined places you can get a digger into.
http://www.youtube.com/watch?v=4MQ4v..._Lf1g&index=21
http://www.youtube.com/watch?v=4MQ4v..._Lf1g&index=21
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