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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
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