Pencil thereby pushing a new tip to the top. Invented by Harold Grossman for Empire Pencil Company in 1967 and subsequently improved upon by Arthur D. Little for Empire from 1969 through the early 1970s; the plastic pencil was commercialised by Empire as the "EPCON" Pencil. These pencils were co-extruded, extruding a plasticised graphite mix within a wood-composite core. Residual graphite from a pencil stick is not poisonous, and graphite is harmless if consumed. Although lead has not been used for writing since antiquity, lead poisoning from pencils was not uncommon. Until the middle of the 20th century the paint used
Lead Upturn 2018: Milestone Lead Upturn 2018: Milestone Lead Upturn 2018: Milestone (stylized as "Lead Upturn 2018 ～MILESTONE～") will be the twenty-first video and fifteenth overall concert video released by the Japanese hip-hop group Lead. The concert video is set to be released on December 19, 2018. The tour is due to correspond with their eighth studio album, "Milestone", along with songs from previous albums, including "Baby'cuz U!" from "4" (2006), "Get Dizzy!" from ""Feel The Vibes"" (2008) and "What cha gonna?" from "Brand New Era" (2004). "Lead Upturn 2018 ~Milestone~" is set to be the twenty-first video and fifteenth overall concert video released