Showa Denko K.k.

So Kanai

Takumi Akatsuka

A pair of reference portionsandis brought into contact with an internal peripheral surfaceof the vicinity of both side end portions of a tubular bodyThe tubular bodyis rotated such that contact portions where the tubular bodyand the pair of reference portionsandcontact move on the internal peripheral surfacein a circumferential direction of the tubular bodywith positions of the pair of reference portionsandfixed. The radial displacement of an external peripheral surfaceof the tubular bodycaused by the rotation of the tubular bodyat at least one positionandof an external side of the tubular elementis detected, wherein the at least one position is fixed relative to the circumferential direction of the tubular element

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Oyama, Japan

So Kanai