Quarterly report pursuant to Section 13 or 15(d)

A. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details-Product warranties)

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A. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details-Product warranties) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Product warranties    
Beginning balance $ 58,791 $ 46,103
Warranty claims incurred (14,580) (66,803)
Provision charged to expense 4,011 79,491
Ending balance $ 48,222 $ 58,791