| 摘要 |
PROBLEM TO BE SOLVED: To provide a gauge capable of greatly enhancing workability during installation of ring-shaped members. SOLUTION: A ring-shaped member 12 with elasticity forming an arc and a plurality of protrusions 121a to 121c are deployed at the backside of the ring-shaped member 12 extending outward, while a plurality of projection trays 141a to 141c are deployed on a transparent material 14 to be engaged with a plurality of protrusions 121a to 121c. COPYRIGHT: (C)2007,JPO&INPIT
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