{TAIL ~ The apparatus} 1, wherein {HEAD ~ the gear} and the balance shaft comprise cast iron, which has a phosphorous component of at most 0.03 mass percent 
{ TAIL ~ The apparatus } 1 , wherein { HEAD ~ the gear } and the balance shaft comprise cast iron , which has a phosphorous component of at most 0.03 mass percent
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH