#coppergradesUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesNewcomers' CommunitySteemit FeedbackSteemitCryptoAcademyআমার বাংলা ব্লগSteem AllianceSteem POD TeamKorea • 한국 • KR • KOSteem For LifestyleBeauty of CreativityAVLE 일상Tron Fan ClubSTEEM CN/中文#coppergradesTrendingHotNewPayoutsMutedkoprex (36)in #coppergrades • 19 days agoCopper Grades Explained: ETP, EC, OFC and DHP CopperCopper is widely used in electrical systems, industrial manufacturing, plumbing, refrigeration, and electronic…