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Explanation: Now we´re cooking with oil!!
Here´s what I found.
Tetron Inc., the premier innovator in slag management technology, is based in Farmington Hills Michigan. The company was incorporated in 1984 to develop and to bring to market technologies for improving the quality and efficiency of steel making. Tetron, Inc. holds several national and international patents, and has a patent pending, for technologies to improve tapping and post-tapping practices. It is the exclusive licenser of Tetron Slag Reduction Devices, commonly known as "Tetrons", the premier vortex-inhibiting slag reduction devices in the world. Since 1992, the company has been developing and refining an integrated slag-management system which, in addition to maximizing yield and purity, reduces slag modifier and aluminum consumption, slag-line erosion in the ladle, and production diversions for chemistry modifications. More recently, Tetron Inc. has undertaken the development of an automated furnace tapping system that will further maximize metal yield and minimize post tap slag entrainment.