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