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A stapler is a mechanical device that joins pages of paper or similar material by driving a thin metal staple through the sheets and folding the ends. Staplers are widely used in government, business, offices, homes and schools.

The word "stapler" can actually refer to a number of different devices of varying uses. In addition to joining paper sheets together, staplers can also be used in a surgical setting to join tissue together with surgical staples to close a surgical wound (much in the same way as sutures).

Most staplers are used to join multiple sheets of paper. Paper staplers come in two distinct types: manual and electric. Manual staplers are normally hand-held, although models that are used while set on a desk or other surface are not uncommon. Electric staplers exist in a variety of different designs and models. Their primary operating function is to join large numbers of paper sheets together in rapid succession. Some electric staplers can join up to 20 sheets at a time. Typical staplers are a third-class lever.

A staple gun is usually a heavier duty, hand-held device; it can be strictly manual or pneumatic. Staple guns are used to fasten a thin material to a solid backing—such as a piece of paper to a bulletin board, or to a piece of wood. The two legs of a staple from a staple gun are not folded over, but are embedded straight into the backing material.

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