Just over the fence from our home is a large macrocarpa hedge which was due for a trim. From inside we heard the zing zing of the blades trimming the hedge.
The following photos shows the machine which was mounted onto an agricultural tractor, that was used to do the work.
Now that is what I call a decent hedge trimmer. You would not want to come into contact with those spinning blades. They must be very sharp looking at the size of the branches being cut. Beats using a pair of hand hedge trimmers and/or a chain saw.
The finished product looks neat and tidy.