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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Equipment parts inventory | $ 706,230 | $ 690,069 | $ 0
Finished goods inventory | 95,603 | 181,453 | 0
Sales demo inventory | 1,074,240 | 1,281,564 | 495,150
Work in process inventory | 66,360 | 19,241 | 0
Total inventory | $ 1,942,433 | $ 2,172,327 | $ 495,150

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