1 Ref: AC.004/2018 26 February 2018 Subject: Management discussion and analysis of financial position and operating results To: President and Manager The Stock Exchange of Thailand Overall operating

(Translation) May 15, 2019 Ref: SET-2019-008 Re: Management Discussion and Analysis for Quarter 1’ 2019 Attn. to: President The Stock Exchange of Thailand Filter Vision Public Company Limited and its

1 No. CC20190504ELE May 14, 2019 Subject Report of the Resolutions of Board of Directors’ Meeting No.2/2019 To President The Stock Exchange of Thailand The Board of Directors’ meeting of Cal-Comp

No. WHAUP-CS014-2562 1 8 August 2019 Re Share Acquisition in Duong River Surface Water Plant JSC in Vietnam Dear President The Stock Exchange of Thailand WHA Utilities and Power Public Company

(Translation) February 27, 2019 Ref: SET-2019-003 Re: Management's Discussion and Analysis and operating results for the Year 2018 Attn. to: President The Stock Exchange of Thailand Filter Vision

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ที่ - Translation - PorBor.076 / 2017 November 14, 2017 Subject: Clarification of operating results change from the same period last year by more than 20% To: President The Stock Exchange of Thailand

1 / 3 IR.031/2020 13 August 2020 Re: Notification of the changes of the Profit and Loss Statement To President The Stock Exchange of Thailand We, T Engineering Corporation Public Company Limited (the

the expenses related to preparation for the planned listing to the Stock Exchange of Thailand in the first quarter of 2017 and increasing of computer system depreciation. Finance costs The Company

for the 3rd Quarter of 2017 Ending 30 September 2017 To : The President The Stock Exchange of Thailand The Board of Directors meeting of Ratchaphruek Hospital Public Company Limited (the Company) No. 5