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Inventories
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
 
Inventories consist of the following: 

 March 31, 2021December 31, 2020
Purchased components$709,841 $716,848 
Finished goods269,785 334,434 
 $979,626 $1,051,282