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Inventories (Tables)
9 Months Ended
Sep. 26, 2020
Inventory Disclosure [Abstract]  
Schedule of net components of inventories
The components of inventories are as follows:
At September 26, 2020At December 31, 2019
Finished goods$1,310,673 1,610,742 
Work in process122,610 144,639 
Raw materials408,690 526,947 
Total inventories$1,841,973 2,282,328