Adjustable ring and ring binders using the same
An adjustable ring having a curved section and two telescoping arms. Each telescoping arm comprises two or more tubes that move relative to each other in a concentric manner between a collapsed state and an extended state to accommodate various amounts of sheet or sheet-like materials. A ring binder can be constructed using one or more of the adjustable rings.
B B B B
B42F B42F B42F B42F
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Zhiqiang Stanley YiFei Genshen Wesley YiMing
Liu Liu Liu Liu