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A paper cutter (or paper guillotine) is a tool often found in offices and classrooms, designed to cut a large set of paper at once with a perfectly straight edge. It can be at least 1 foot (30cm) in length on each site for small work, but can often be longer than 2 feet (61cm) on each side.

The surface of a paper cutter will usually have a grid either painted or inscribed on it, and it may have a ruler across the top for straightedge guidance. At the very least, it must have a flat edge against which the user may line up the paper at right-angles before passing it under the blade.

On the right hand edge of a paper cutter is a long, curved steel blade, often referred to as the knife, attached to a steady steel base at the top right hand corner for cutting.The combination of a blade mounted to a steady base produces ideal clean and straight cuts, the likes of which would have otherwise required a ruler and razor blade to achieve on a single page..

Source: wikipedia.org
Photo credit: bmuschool.org