ClearSign Technologies Corporation (NASDAQ:CLIR) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and support the use of cleaner fuels including hydrogen, today announces that it has received another purchase order for a ClearSign Core™ M1 burner. The order was received from heater manufacturer Tulsa Heaters Midstream ("THM") and is the fourth order from this customer destined for the Permian Basin in West Texas.