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for filing 
spring binder
Binder in which sheets of paper are held in place by the pressure of springs.
fastener binder
Binder with a flexible rod fitted with two sliding rings; it is used to hold and file punched sheets of paper.
clamp binder
Binder fitted with a spring clip; it is used to hold and file sheets of paper.
dividers
Heavyweight sheets of paper with side tabs; they are used to separate groups of pages inside a binder.
