PTR [PETROCHINA CO] CORRESP: (Original Filing)
[April 1, 2011 H. Roger Schwall Re: PetroChina Company Limited Dear Mr. Schwall, Mr. Cannarella and Mr. Shannon: We received your letter on March 22, 2011 and we are in the process of collecting and investigating the relevant facts in order to prepare accurate and complete answers to these issues. Therefore, we respectfully request an extension of the deadline to]