Continuation of Project from Engineering OrderTULSA, Okla., Nov. 27, 2024 /PRNewswire/ -- ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that support decarbonization, improve operational and energy efficiency, enable the use of hydrogen as a fuel and enhance safety while dramatically reducing emissions, announces that it has received the follow-on purchase order to retrofit four process heaters with a tot ...