TULSA, Okla. (AP) — TULSA, Okla. (AP) — ClearSign Technologies Corporation (CLIR) on Friday reported a loss of $2.2 million in its first quarter.
On a per-share basis, the Tulsa, Oklahoma-based company said it had a loss of 39 cents.
The combustion systems technology company posted revenue of $191,000 in the period.
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