In addition, the pocket inner surface of the retainer of the transmission apparatus is formed in {TAIL ~ a curved surface} surrounding a peripheral portion of a ball housed in a pocket, thus allowing {HEAD ~ easy and accurate formation} of pockets 
In addition , the pocket inner surface of the retainer of the transmission apparatus is formed in { TAIL ~ a curved surface } surrounding a peripheral portion of a ball housed in a pocket , thus allowing { HEAD ~ easy and accurate formation } of pockets
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