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15. ACCRUED WARRANTY (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Accrued Warranty |  |
Accrued Warranty Costs, Beginning Balance | $ 30,000 | $ 30,000
Provision for Product Warranty Expense | 101,041 | 2,609
Settlement of Warranty Claims | (63,041) | (2,609)
Accrued Warranty Costs, Ending Balance | $ 68,000 | $ 30,000

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