In addition to this structure, the additional speed change mechanism 6 may preferably be fashioned to {HEAD ~ a fluid operated mechanism} which has {TAIL ~ fluid operated clutches} 12 and 13, as shown in FIG 1A, mounted on the first speed change shaft 5 
In addition to this structure , the additional speed change mechanism 6 may preferably be fashioned to { HEAD ~ a fluid operated mechanism } which has { TAIL ~ fluid operated clutches } 12 and 13 , as shown in FIG 1A , mounted on the first speed change shaft 5
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