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NOTE 4 — Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Inventories
       
   March 31,  December 31,
   2022  2021
Raw materials and sub-assemblies  $5,774,323   $5,757,869 
Finished goods   320,193    277,598 
Inventory reserves   (880,943)   (880,943)
Inventory, net  $5,213,573  $5,154,524