| 摘要 |
A support including a support pipe having a pair of elongated holes formed therein, a support ring, an insertion pipe having plural pairs of pin holes formed therein, and a support pin. The support ring includes a main support ring member having an internal thread formed in the inner peripheral portion thereof and an upper support ring member rotatably coupled to the upper end portion of the main support ring member via an upper thrust bearing. A rotary operation handle is fitted to the outer peripheral portion of the main support ring member.
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