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en.wikipedia.org/wiki/Mechanical_pencil

A mechanical pencil (US English) or a propelling pencil (UK English) 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 ...

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.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.

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

Oct 22, 2017 ... Invention of the Mechanical Pencil (December 20, 1822) ... were the first to patent a metal pencil with an internal mechanism for propelling the ...

bleistift.blog/2013/08/origins-of-the-mechanical-pencil

Aug 16, 2013 ... Origins of the Mechanical Pencil. The mechanical pencil is a seemingly simple utensil whose invention and development actually took decades ...

www.innovateus.net/innopedia/what-history-mechanical-pencil

Nearly all mechanical pencils can be refilled by the lead that are available that are made for the pencil. Mostly the lead ranges from 0.5 mm to 2 mm in diameter.

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

Joey's answer is partially correct. The first patent for the mechanical pencil was granted in 1822 to the silversmith Sampson Mordan and engineer John Isaac ...

www.reference.com/history/invented-mechanical-pencil-c623087f623c5684

The first patent recorded for a mechanical pencil was filed in England in 1822. Sampson Mordon and Gabriel Riddle invented what was essentially a refillable ...