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Inventories
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories consist of the following:

 
December 31,
 
2017
 
2016
Purchased components
$
505,293

 
$
466,906

Work in progress
—

 
154,971

Finished goods
864,354

 
630,361

 
$
1,369,647

 
$
1,252,238