BRIEF-Tellhow Sci-Tech signs letter of intent to buy Tsinghua Tongfang's clean technology firm

March 17 (Reuters) - Tellhow Sci-Tech Co Ltd

* Says it signs letter of intent to buy Tsinghua Tongfang's

clean technology firm

Source text in Chinese: http://bit.ly/2mBlL9C

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(Reporting by Hong Kong newsroom)