test of prerotator - 230tr/min with flexible shaft
video of pre-rotator test - http://youtu.be/4UIv0qInZJ4
http://www.youtube.com/watch?v=4UIv0qInZJ4
video of pre-rotator test - http://youtu.be/4UIv0qInZJ4
http://www.youtube.com/watch?v=4UIv0qInZJ4
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