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