| 摘要 |
A binder for filing loose leaf pages perforated with three holes. The binder has three posts made of flexible, hollow metal springs. A fastener locks the pages on the spring posts. On the inner cover opposite the spring posts there are three rigid posts on a common shaf t. During page insertion and removal, each rigid post is inserted into the opposite spring post. This creates an arch. Pages are moved along the arch, so the order of the pages is maintaine d.
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