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This is a fully functional human size Lego Technic prosthetic hand.
It is operated using:
-2 lego pneumatic pumps ( can be substituted by a mini pump compressor )
-10 lego pneumatic valves
-2 lego large pneumatic cylinders
-8 lego mini pneumatic cylinders
-1 Power Functions battery box
-1 large motor ( Power Functions )
-1 servo motor ( Power Functions )
-1 battery box ( Power Functions )
-1 electric switch ( Power Functions )
And many Lego Technic parts
-each finger can be operated independently ( including the thumb )
-the thumb has 3 degrees of freedom
-fingers can be spread out and folded.
It can actualy hold objects.