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