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