一E604010機械安裝業︵在客戶處作業︶.二E603100電焊工程業︵在客戶處作業︶.三E603110冷作工程業︵在客戶處作業︶.四E603120噴砂工程業︵在客戶處作業︶.五E599010配管工程業︵在客戶處作業︶.