November 13, 2017 The President & Director, The Stock Exchange of Thailand (SET) LETTER OF CLARIFICTION: CENTEL’s Q3/2017 & YTD 9 MONTHS /2017 OPERATING PERFORMANCE RESULTS This is to inform the SET

Assets dated 31 August 2008 (as amended), and the Notification of the Board of Governors of the Stock Exchange of Thailand Re: Disclosure of Information and Other Acts of Listed Companies Concerning the

., and Schedule for the EGM of Shareholders No. 1/2019 To: The President The Stock Exchange of Thailand Enclosure: 1. Information Memorandum of Hydrotek Public Company Limited on Disposal of Assets and

., and Schedule for the EGM of Shareholders No. 1/2019 (Revised) To: The President The Stock Exchange of Thailand Enclosure: 1. Information Memorandum of Hydrotek Public Company Limited on Disposal of

., and Schedule for the EGM of Shareholders No. 1/2019 (Revised2) To: The President The Stock Exchange of Thailand Enclosure: 1. Information Memorandum of Hydrotek Public Company Limited on Disposal of

., and Schedule for the EGM of Shareholders No. 1/2019 (Revised3) To: The President The Stock Exchange of Thailand Enclosure: 1. Information Memorandum of Hydrotek Public Company Limited on Disposal of

Stock Exchange of Thailand; “Authorized person in private fund management” means the following persons: (1) Any person, who take responsibility in private fund management, from the position of private

; “Securities exchange” means The Stock Exchange of Thailand; “Authorized person in private fund management” means the following persons: (1) Any person, who take responsibility in private fund management, from

giving advice concerning the investment or procurement for benefit from mutual fund assets to management company in any types of fund; “Securities exchange” means The Stock Exchange of Thailand

in back-to-back basic to match raw material purchase order with sell order to avoid unnecessary stock. 2. The Company will be able to access various source of funds (i.e. debt/equity instruments) to