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ST Helmets & Technology LLC (STET) ke mohlahisi le mofani oa thepa ea theknoloji e khethehileng ea ho sebetsa bakeng sa molemo oa thepa e ntle ea likaroloana. thehiloe ka 1989, ST e sebelisitse theknoloji ea thepa ho nts'etsapele e ikhethang, triboelectrostatic bel separator. Esale e le hoo, karohano e kopaneng le e bonolo ho e lumella e ruile molemo ka har'a liindasteri tse 'maloa. kajeno, k'hamphani e thehiloeng United States e sebelisitse likarohano tse ngata, le hantle ho feta 100 lilemo tsa ts'ebetso ea mochini, Amerika Leboea, Europe le Asia. Setsi sa boenjiniere sa boemo bo holimo se Needham, MA, USA e etsa lipatlisiso le nts'etsopele, ho akarelletsa le motsamaisi liteko tsa thepa e ncha le ntshetsopele tse ling tsa theknoloji e.
