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| XNAS - NASDAQ | ClearSign Technologies Corporation - CLIR |
| XNYS - New York Stock Exchange | ClearSign Technologies Corporation - CLIR |
| XLON - London Stock Exchange | Clearsign Combustion Corp. - 0I0B |
| XBER - Berlin Stock Exchange | Clearsign Technologies Corp. - 4CC |
| XFRA - Frankfurt Stock Exchange | Clearsig. Combust. - 4CC |
| XSTU - Stuttgart Stock Exchange | ClearSign Technologies Corp. - 4CC |
