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14. ACCRUED WARRANTY (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Accrued Warranty |  |
Beginning accrued warranty costs | $ 30,000 | $ 5,000
Provision for warranty expense | 2,609 | 47,454
Settlement of warranty claims | (2,609) | (22,454)
Ending accrued warranty costs | $ 30,000 | $ 30,000

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