. Slib Soongswang) Chief Executive Officer Authorized Signatory Attachment 1 (F 53-4) 1/6 Capital Increase Report Form Hydrotek Public Company Limited 21 September 2017 We, Hydrotek Public Company Limited

. Pattarapol Woranimman, effective from December 12, 2017 onwards. Please be informed accordingly. Yours Sincerely, -Signature- (Mr. Teerawit Charuwat) Director and Chief Executive Officer บมจ.0107537002109

of Board of Directors of MK as of November 28, 2018 are as follows: Name Position Mr. Suthep Wongvorazathe Chairman of the Board Mr. Vorasit Pokachaiyapat Chief Executive Officer Managing Director

, -Signature- (Mr. Teerawit Charuwat) Director and Chief Executive Officer บมจ.0107537002109 บริษทั ดีมีเตอร ์คอรป์อเรชั น จาํกดั (มหาชน) Demeter Corporation Public Company Limited เลขที 191/43 อาคารซีทีไอ ทาวเว

(executive summary) สว่นที ่1.2 บรษิทัทีอ่อกหลกัทรพัยแ์ละขอ้มลูเกีย่วกบั กำรเสนอขำยหลกัทรพัย ์ สว่นที ่2 Executive Summary and Corporate and Offering Information สว่นที ่2.1 Executive Summary สว่นที ่2.2

sincerely, -signed- (Mr. Chaiwat Kovavisarach) President and Chief Executive Officer The Secretary to the Board of Directors Division Tel: 0 2335 4638 Fax: 0 2016 3982 Preliminary Information of the Employee

be informed accordingly. Yours faithfully, For and on behalf of Diamond Building Products Public Company Limited (Mr. Asanee Chantong) Chief Executive Officer - 1 - DIAMOND BUILDING PRODUCTS PUBLIC

. Asanee Chantong) Chief Executive Officer - 1 - DIAMOND BUILDING PRODUCTS PUBLIC COMPANY LIMITED AND ITS SUBSIDIARY MANAGEMENT DISCUSSION AND ANALYSIS (For the Consolidated Financial Statements of the 3rd

water treatment systems 85.84 25.56 Total 873.46 768.47 Yours Truly, WIIK PUBLIC CO., LTD. Mr. Wiboon Sangwithayanon Chief Executive Officer

benefits, deposit of rental and service fee and other non-current liabilities. Please kindly be informed accordingly. Sincerely yours, Mr. Opas Sripayak Chief Executive Officer and Managing Director 8