About usCorporate responsibilityCareersNewsroomInvestorGrants and givingiStockUnsplashPhotos.comBecome an AffiliateCustomer supportEvents and webinars  B.", was in use a minimum of as early as 1814.[sixty seven] Softer or more durable pencil grades ended up explained by a sequence or successive Bs or Hs including BB and BBB for successively sof