ClearSign Technologies Corporation announced that ClearSign's partner California Boiler has received a letter of intent for four boilers to be fitted with the ClearSign Core? (Rogue) burners as well as the purchase order for the first boiler burner of the series, and has in turn placed their order with ClearSign for the first burner. This order is from a fruit and vegetable multi-juice processing company located in California'sCentral Valley.  California Boiler initially received a letter of intent for the purchase of four 475hp boilers, including ClearSign Core (Rogue) burners, followed by the first purchase order in the series of four ordered boilers.  The additional burner orders will be issued concurrent with the construction of additional planned fruit processing lines of the customer.