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ACCRUED WARRANTY (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
ACCRUED WARRANTY |  |
Beginning accrued warranty costs | $ 68,000 | $ 30,000
Provision for warranty expense | 18,834 | 101,041
Settlement of warranty claims | (18,834) | (63,041)
Ending accrued warranty costs | $ 68,000 | $ 68,000

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