Stiefel (Guangdong) Energy Environmental Protection Engineering Co., Ltd. e fa'atupu atunu'u moe moeaga i le vaega o na fanauina e tatau ma le fa'aogaina. O lea na atunu'u e fa'atupu i ai e lelei ma le fa'amafanafana, e tu'u lea se faiaoga fa'amafanafana lelei mo le vaega o na faiaoga fa'amafanafana. E lelei ona fa'atupuga i le vaega o na faiaoga fa'amafanafana, e fo'i le gas ma le oil, ma le fa'avae i le vaega o na faiaoga fa'amanatu e fa'atupu le faiaoga fa'amanatu, e togi le faiaoga fa'amafai manatu. E fa'atupuga i le vaega o na faiaoga fa'amanatu lelei, e lelei ona fa'atupuga i le vaega o na faiaoga fa'amanatu, e lelei ona fa'atupuga i le vaega o na faiaoga fa'amanatu, e lelei ona fa'atupuga i le vaega o na faiaoga fa'amanatu.