★ Cov kws tshaj lij engineers thiab cov kws tshawb fawb hauv Aluminium kev lag luam ntawm dross tuav thiab Dross Compression Systems.
★ Twb tau nyob ib ncig ntawm 250 dross presses kev pib hauv 1980's.
★ Cov khoom siv ruaj khov heev siv tau.
★ Kev cai ua cov khoom siv kho tshuab (qhov chaw).