ClearSign Technologies Corporation (CLIR) provides updates on first-quarter 2024 operations prior to hosting its investors' call.During the quarter ended on Mar 31, 2024, the company received two further purchase orders to finish the entire engineering of burners for the conversion of two more process heaters at the California refinery, bringing the total to four burners. This initial engineering is expected to be followed by purchase orders for burner manufacturing and supply.ClearSign Technologies also an ...