| 摘要 |
A set of binders includes round ring binders and binders with flattened rings, having the same exterior appearance, but with the flattened ring binders, accommodating wider sheets, such as index sheets. Individual flattened ring binders include reliable over-center ring operating action with elongated plates to which the rings are secured, and an overlying elongated spring cover to apply inward pressure on the plates. Using flattened rings, the covers of the binders may be reduced in extent.
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