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