Another object of the present invention is to provide {HEAD ~ a two step centrifugal spark advancer} which is convenient for {TAIL ~ adjustment} and massproduction 
is convenient for
Another object of the present invention is to provide { HEAD ~ a two step centrifugal spark advancer } which is convenient for { TAIL ~ adjustment } and massproduction
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH