==United States Radium Corporation==From 1917 to 1926, U.S. Radium Corporation, originally called the Radium Luminous Material Corporation, was engaged in the extraction and purification of radium from carnotite ore to produce luminous paints, which were marketed under the brand name "Undark".
== Корпорация US Radium ==В период с 1917 по 1926 года корпорация "United States Radium Corporation", первоначально называвшаяся "Radium Luminous Material Corporation", занималась добычей и переработкой радия из карнотитовых руд с целью производства светящейся краски, продаваемой под торговой маркой "Undark" (букв.