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A well-used modern desk-style electric pencil sharpener. The oldest surviving electric pencil sharpener is the Boston Polar Club pencil sharpener, introduced around 1936. [19] Electric pencil sharpeners work on the same principle as manual ones, but one or more flat-bladed or cylindrical cutters are rotated by an electric motor. [16]
A penknife might also be used to sharpen a pencil, [3] prior to the invention of the pencil sharpener. In the mid-1800s, penknives were necessary to slice the uncut edges of newspapers and books. [4] A penknife did not necessarily have a folding blade, but might resemble a scalpel or chisel by having a short, fixed blade at the end of a long ...
A sharpener is a tool for sharpening. It may refer to: Knife sharpener, a tool for sharpening a knife Sharpening steel, a tool for sharpening a knife, usually a kitchen knife; Sharpening stone, a tool for sharpening a bladed or edged tool, such a knife; Pencil sharpener, a tool for sharpening a pencil
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A ballpoint pen knife is generally a pen with a concealed knife inside, which can be used as a letter opener or as a self-defense weapon. Gravity lock ball bearing pocketknife. Gravity lock ball bearing pocketknife, locks with sphere dropping in and out into grove. Has to be oriented tip up and pressed to release, tip down and pressed to lock.