{HEAD ~ a main speed change mechanism} disposed within 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 {TAIL ~ a second speed change shaft} , 
{ HEAD ~ a main speed change mechanism } disposed within 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 { TAIL ~ a second speed change shaft } ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH