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Wikipedia definition
1. Oxygen-free copperOxygen-free copper (OFC) or Oxygen-free high thermal conductivity (OFHC) copper generally refers to a group of wrought high conductivity copper alloys that have been electrolytically refined to reduce the level of oxygen to .001% or below.
Read “Oxygen-free copper” on English Wikipedia
Read “無酸素銅” on Japanese Wikipedia
Read “Oxygen-free copper” on DBpedia

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