一E604010機械安裝業.︵在客戶處作業︶二E603110冷作工程業.︵在客戶處作業︶三E603100電焊工程業.︵在客戶處作業︶四E599010配管工程業.︵在客戶處作業︶五F111070金屬建材批發業.