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Inventories
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
 
Inventories consist of the following: 

 June 30, 2021December 31, 2020
Purchased components$755,578 $716,848 
Finished goods273,576 334,434 
 $1,029,154 $1,051,282