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en.wikipedia.org/wiki/Mechanical_pencil

A mechanical pencil (US English) or propelling pencil (UK English), also clutch pencil, is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" /ˈlɛd/. The lead, often made of graphite, is not bonded to the outer casing, and can ... Mechanical pencils were first used in the 18th century, with many designs ...

www.historyofpencils.com/writing-instruments-history/history-of-mechanical-pencils

Mechanical pencils are also old invention dating even from 16th century. First ones were fairly simple mechanisms, only to become more complex with time.

pencils.com/brief-history-mechanical-pencil

Nov 18, 2014 ... But the first mechanical pencil patent wasn't applied for until 1822, when ... This is when Joseph Hoffmann invented the pushbutton clutch in ...

www.historyofinformation.com/expanded.php?id=3851

Invention of the Mechanical Pencil (December 20, 1822) ... were the first to patent a metal pencil with an internal mechanism for propelling the graphite (pencil ...

www.sharp-world.com/corporate/info/his/h_company/1915_1919

A Writing Instrument Ahead of its Time. World's First Mechanical Pencils. The mechanical pencil is well known today throughout the world, largely thanks to ...

www.quora.com/Who-invented-the-mechanical-pencil

The first patent for the mechanical pencil was granted in 1822 to the silversmith Sampson Mordan and engineer John Isaac Hawkins. However, a model was ...

www.popularmechanics.com/technology/a21567/history-of-the-pencil

Aug 16, 2016 ... In fact, pencil-makers have been making "lead holders," early versions of mechanical pencils, for centuries. These lead holders were made of ...

www.pens.co.uk/pen2paper/wp-content/uploads/2016/09/The-History-of-the-Pencil.pdf

first invented in China in the first century AD, it did not reach Europe until the 8th .... The earliest known example of a mechanical pencil was found aboard HMS.

discovermagazine.com/2007/may/20-things-you-didnt-know-about-pencils

May 14, 2007 ... 5 Pencil marks are made when tiny graphite flecks, often just ... 1795; Bernard Lassimone, who patented the first pencil sharpener in 1828; and Therry des Estwaux, who invented an improved mechanical sharpener in 1847.