 SEATTLE, March 23, 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, announces it has successfully installed three burners in an existing process heater at a California storage and transportation terminal. The burners were sold and installed by ClearSigns channel affiliate, California Boiler, who is the subcontractor to the overall project management company, R. 