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