Signed contract to purchase aerated concrete machine

Our Ref: ST.010/2004/0007 February 17, 2004 Subject:Signed contract to purchase aerated concrete machine Attention:The President The Stock Exchange of Thailand Whereas, Sino-Thai Engineering and Construction Public Company Limited (STECON) has jointly invested in autoclaved aerated concrete project by establishing Autoclaved Aerated Concrete Product Company Limited on January 30, 2004. The Company would like to inform the SET that on February 16, 2004 Autoclaved Aerated Concrete Product Company Limited signed contract to purchase aerated concrete machine with WEHRHAHN & GmbH from Germany. The contract price is approximately 4.15 million EURO. Please be advised and disclose to investors and public. Your sincerely, Woraphant Chontong (SVP) Finance and Accounting Division