| 摘要 |
A cost effective ring binder for envelopes with edge slots has the rings (8) moulded in one piece with a stud mount (11,12,13) whose stud ends are pushed through holes in the spine of the folder and secured by grip collars (14) on the outside of the spine. The cross section of the rings is non circular eg. elliptical, to engage and release the grip slots of the envelopes by a simple twist action. The envelopes are also fitted and removed simple by pulling or pressing, using the elasticity of the edge slots.
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