Production start in Q4/2021 means customer pays bill in Q4/2021 or Q1/2022. In the former case, we should see a jump in revenue in the 2021 annual report, due by the end of April 2022. In the latter case, increased revenue should be reported in the Q1/2022 financial statements, due by the end of May 2022.
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I wonder if any of the "three" other products currently being developed by POET might actually beat this one to production and their bottom line...