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Inventories
3 Months Ended
Mar. 31, 2020
Inventory, Net [Abstract]  
Inventory Disclosure
5. Inventories
 March 31, 2020December 31, 2019
Raw materials$486,866  $467,912  
Work in progress172,173  162,670  
Finished goods300,725  280,051  
Subtotal959,764  910,633  
Less reserves(107,689) (104,492) 
Total$852,075  $806,141