PTR [PETROCHINA CO] 6-K: 中國石油天然氣股份有限公司 PETROCHINA COMPANY LIMITED (a joint stock limited
[中國石油天然氣股份有限公司 PETROCHINA COMPANY LIMITED (a joint stock limited company incorporated in the Peoples Republic of China with limited liability) (Stock Code: 857) ADVANCE NOTICE FOR ESTIMATED PROFIT OF THE INTERIM RESULTS OF 2018 Company Group Listing Rules This announcement is made by PetroChina Comp]