Pencil
The production of graphite leads from graphite and clay was patented in 1802 by Josef Hardtmuth. The original company located in Ceske Budejovice (in the Czech Republic) is still currently one of the world leaders in the production and distribution of the first-rate pencils and other stationery.
Natural graphite can be found in many objects from pencils to high-tech applications. Graphene, the natural occurrence of a single sheet of graphite, is among the strongest substances known and has very unique physical properties.