. 0355/2020 January 23, 2020 Re: Notification of the Resolution of the Board of Directors' Meeting and the Invitation to the Extraordinary General Meeting of Shareholders No. 1/2020 To: The President The

September 2017 Subject: Notification of the Board of Directors No.8/2017 and the date of the Extraordinary General Meeting of Shareholders No. 1/2017 (Amended) To: The President The Stock Exchange of Thailand

September 2017 Subject: Notification of the Board of Directors No.8/2017 and the date of the Extraordinary General Meeting of Shareholders No. 1/2017 (Amended 2) To: The President The Stock Exchange of

September 2017 Subject: Notification of the Board of Directors No.8/2017 and the date of the Extraordinary General Meeting of Shareholders No. 1/2017 (Amended 3) To: The President The Stock Exchange of

UNOFFICIAL TRANSLATION Readers should be aware that only the original Thai text has legal force and that this English translation is strictly for reference. Notification of the Capital Market

Ministry of Commerce, shall be authorized to amend or add wordings in compliance with the Registrar’s directions: Articles of Association of the Company Chapter 2 Shares and Shareholders The Existing

Notification of the Securities and Exchange Commission No. KorChor. 5/2552 Re: Definitions used in the SEC’s Notifications Relating to Issuance and Offering of any Type of Debt Securities dated March 13, 2009. 6

2017 Subject: Notification of the Board of Directors No. 9/2017, determination of the date of the Extraordinary General Meeting of Shareholders No.1/2017, determination of all Record Date and Asset

ไฮโดรเท็ค จํากดั (Translation) No. 024/0461 April 4, 2018 Subject Notification of the Board of Directors No.6/2018 Re: Convening the Extraordinary Shareholders’ Meeting No.1/2018; an Acquisition of

the Notification of the Capital Market Supervisory Board No. TorChor. 20/2551 Re: Rules on Entering into Material Transactions Deemed as Acquisition or Disposal of Assets dated August 31, 2008 (as