| 摘要 |
Drumhead tightening devices include lugs secured to a shell of a drum, lug bolts screwed to the lugs, hooks, which are engaged with a hoop fitted to an open end of the shell, and retaining members for retaining the position of the hooks with respect to the lug bolts. Each retaining member is mounted on one of the lug bolts in a state where the associated hook is arranged between a head portion of the lug bolt and the retaining member.
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