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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 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
[citation needed] Marks made by grease pencils are resistant to moisture and can usually be removed by rubbing the marked surface with a paper towel. Grease pencils are available in several forms. The outer casing may be made of wood (like an ordinary pencil) and sharpened with a knife or pencil sharpener. Other types are covered in paper and ...
A typical construction of a ratchet-based mechanical pencil. A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈ l ɛ d /. The lead, often made of graphite, is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from ...
The Blackwing 602 is a pencil that is noted for its soft, dark graphite, unique flat square ferrule and replaceable eraser. It was manufactured by the Eberhard Faber Pencil Company from 1934 to 1988, then by the Faber-Castell pencil company from 1988 to 1994 and by Sanford from 1994 to 1998. [1] The pencil initially sold for 50 cents each.
Sharpeners may also have regular 'stops' in busy streets or residential areas, calling out to people from their homes or businesses using musical instruments such as handbells or pipes. The sharpener usually has some sort of mobile work bench with a grinding wheel which may be powered by hand, using a bicycle mechanism or electric motor.