{TAIL ~ Coupling mechanism} 10 includes a driving arm 11 directly coupled to output shaft 5, a driven arm 12 directly coupled to shaft 3, and an elastic coupling member 13 for elastically coupling driving arm 11 to {HEAD ~ driven arm} 12 
{ TAIL ~ Coupling mechanism } 10 includes a driving arm 11 directly coupled to output shaft 5 , a driven arm 12 directly coupled to shaft 3 , and an elastic coupling member 13 for elastically coupling driving arm 11 to { HEAD ~ driven arm } 12
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