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INTANGIBLE ASSETS (Schedule of Patents) (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Patents $ 1,345,221 $ 1,327,000
Less: Accumulated amortization 454,887 411,000
 Intangible assets - net $ 890,334 $ 916,000