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Pantographic knife
A Pantographic knife, also known as a paratrooper knife, is a folding knife whose blade is fully enclosed by its handles when closed, in a manner similar to a balisong knife (commonly called a butterfly knife in western countries) - with which it is often confused. Unlike the balisong knife, the pantographic knife uses a pantograph linkage to keep the handles aligned during opening and closing (whereas balisong knife handles swing freely and independently).
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