{TAIL ~ A particularly important advantage} of the adjusting device 6 is that the planetary gear train is small in diametrical size as compared with ordinary reduction gears which generally consist of spur gears or {HEAD ~ helical spur gears} so that the device is both compact and simple 
{ TAIL ~ A particularly important advantage } of the adjusting device 6 is that the planetary gear train is small in diametrical size as compared with ordinary reduction gears which generally consist of spur gears or { HEAD ~ helical spur gears } so that the device is both compact and simple
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