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2. Pencil - Wikipedia

   en.wikipedia.org/wiki/Pencil

   Two graphite pencils. Both are labelled "HB", but the numeric label differs between "2" and "2 1 ⁄ 2 ". A grading chart ranging from 9B to 9H. Graphite pencils are made of a mixture of clay and graphite and their darkness varies from black to light grey. A higher amount of clay added to the pencil makes it harder, leaving lighter marks.

3. Dixon Ticonderoga - Wikipedia

   en.wikipedia.org/wiki/Dixon_Ticonderoga

   The Dixon Ticonderoga Company (/ t aɪ k ɒ n d ə ˈ r oʊ ɡ ə /) is an American manufacturer of office and art supplies based in Heathrow, Florida.A subsidiary of Italian-based F.I.L.A. SpA, the company offers a number of brands, with one of the most well-known being Ticonderoga: the yellow No. HB 2 pencil known for its distinctive green and yellow ferrule.

4. HB - Wikipedia

   en.wikipedia.org/wiki/HB

   HB, logo for the Staatliches Hofbräuhaus in München, ... HB pencil (hard black), a classification of pencils; HB, a flammability rating as set forth in UL 94;

5. Blackwing 602 - Wikipedia

   en.wikipedia.org/wiki/Blackwing_602

   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.

6. Mechanical pencil - Wikipedia

   en.wikipedia.org/wiki/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 use.

7. Optical mark recognition - Wikipedia

   en.wikipedia.org/wiki/Optical_mark_recognition

   The first mark sense scanner was the IBM 805 Test Scoring Machine; this read marks by sensing the electrical conductivity of graphite pencil lead using pairs of wire brushes that scanned the page. In the 1930s, Richard Warren at IBM experimented with optical mark sense systems for test scoring, as documented in US Patents 2,150,256 (filed in ...