 SEATTLE, June 15, 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, today provides an update on operations for the first quarter ended on March 31, 2021. During the first quarter of 2021, we continued to move strategic projects forward, to install more of our products in the field, and with the addition of completing our first performance test for a supermajor and our field installations performing well, we believe the industry at large is starting to accept our best in class technologies as mainstream. 