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Sheldon Karesh and Dusan Prevorsek Allied-Signal, Morristown Sheldon Karesh and Dusan Prevorsek developed the revolutionary high-strength SPECTRA polyethylene fiber. Applications for this fiber include cut-resistant gloves for surgeons, bullet-proof vests, helmets and armor for law enforcement agencies, sports equipment such as kayaks, canoes, bicycles, boats, sails and skis, and artificial tendons, ligaments and joint prostheses.