E141117 Our Ref: TL034/17 November 14, 2017 The Stock Exchange of Thailand 93, The Stock Exchange of Thailand Building Ratchadapisek Road, Dindaeng, Bangkok 10400 Attention: The President Dear Sir

1 / 2 IR.011/2019 14 May 2019 Re: Notification of the changes of the Profit and Loss Statement To President The Stock Exchange of Thailand T Engineering Corporation Public Company Limited (the

November 28, 2005 No. 7 /2018 May 10, 2018 President The Stock Exchange of Thailand 93 Ratchadapisek Road, Kwang Dindaeng, Khet Dindaeng, Bangkok 10400 Subject : Clarification of the operating result

MMS-AC60/029 9 August 2017 Subject: Discussion and analysis of the operating results for the second quarter of 2017, ending 30 June 2017 To: The President of the Stock Exchange of Thailand Matching

MMS-AC60/038 8 November 2017 Subject : Clarification of the operating results for the third quarter of 2017, ending 30 September 2017 To: The President of the Stock Exchange of Thailand Matching

1 27 May 2019 Subject: Explanation of operating result in the financial statement ended 31 March 2019 To: President of the Stock Exchange of Thailand With reference to the financial statement of FY

1 8 August 2019 Subject: Explanation of operating result in the financial statement ended 30 June 2019 To: President The Stock exchange of Thailand With reference to the financial statement of Q1

November 28, 2005 No. 8 /2018 August 9, 2018 President The Stock Exchange of Thailand 93 Ratchadapisek Road, Kwang Dindaeng, Khet Dindaeng, Bangkok 10400 Subject : Clarification of the operating

No No. CC20200505ELE May 12, 2020 Re: Clarification of the changes in operation performance for the first quarter ended 31 March 2020 Attn: The President The Stock Exchange of Thailand Cal-Comp

- 1 - AIT (VP-SEC) 024E/2019 August 8, 2019 Subject: Management's Discussion and Analysis of Operating Results for Q2-2019 To: The President of The Stock Exchange of Thailand Summary of Operations Q2