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1984年,联邦德国的施科姆茨有限公司Schmetz GmbH,开发了一种有前置装料机构,并配有超压淬火和双向淬火系统的真空电炉。该系统被命名为“2R系统”。
In 1984, Schmetz GmbH, a division of Schmitz GmbH in the Federal Republic of Germany, developed a vacuum electric furnace with a pre-charge mechanism and equipped with an overpressure quenching and a bidirectional quench system. The system is named “2R System.”