CLIR - ClearSign Technologies said it has appointed Matthew Martin as CTO November, 07 2023 08:54 AM ClearSign Technologies Corporation 2023-11-07 08:54:49 ET More on Clearsign Technologies ClearSign secures support, collaboration from SoCalGas for hydrogen project Clearsign Technologies Q2 2023 Earnings Preview For further details see: ClearSign Technologies said it has appointed Matthew Martin as CTO