Original test machine built from a winch and equipped with spring loaded discharge chute.
A few machines were sold in the US with features similar to Patent 7070132 and a 120V 60Hz motor . This machine will shred branches up to 1.5 in diameter. The use of high torque shredding rollers makes the shredder self feeding.
Patent drawing and information: .http://www.google.com/patents/US7070132