Spring clamp binders that include sheet retention mechanisms that provide improved performance and increase manufacturing efficiency and cost-effectiveness are described. The spring clamp binders have a cover and one or more spring clamps for holding one or more items, including sheets of physical media,...http://www.google.es/patents/US7757358?utm_source=gb-gplus-sharePatente US7757358 - Sheet retention mechanisms for spring clamp binders
Sheet retention mechanisms for spring clamp binders
