{HEAD ~ a main speed change mechanism} disposed within {TAIL ~ a front half} of said transmission casing so as to perform a second speed change transmission between a drive shaft , driven by said first speed change shaft , and a second speed change shaft , 
disposed within
{ HEAD ~ a main speed change mechanism } disposed within { TAIL ~ a front half } of said transmission casing so as to perform a second speed change transmission between a drive shaft , driven by said first speed change shaft , and a second speed change shaft ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH