ClearSign Technologies Corporation Receives Certification for Firetube Boiler Burner in China

SEATTLE, April 28, 2021 /PRNewswire/ -- ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, announced today that the Company has received official certification from the Chinese government confirming that its 125hp (2-ton) fire tube boiler burner is