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ACC1/19-007 February 18, 2019 Subject: Management Discussion and Analysis for the year ended December 31, 2018 To: Director and Managing Director The Stock Exchange of Thailand Qualitech Public

ACC1/20-012 February 25, 2020 Subject: Management Discussion and Analysis for the year ended December 31, 2019 To: Director and Managing Director The Stock Exchange of Thailand Qualitech Public

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ACC6207/003 25 July 2019 Subject Inform the progress of the sale stock in the subsidiary company To Director/ Managing Director The Stock Exchange of Thailand Refer to the company's letter No

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