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Property, Plant, and Equipment, Net
 9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment, Net Property, Plant, and Equipment, Net
Property, plant, and equipment, net consists of the following (in thousands):
September 30,
2020		December 29,
2019		Depreciable
Life – Years
Land$1,663 $1,663   
Buildings6,027 5,934 
23 – 40
Shop equipment23,007 22,982 
7 – 10
Leasehold improvements1,248 1,234 
3 – 10
Office equipment1,936 1,866 
3 – 7
Mobile equipment152 190 3
Construction in progress2,745 1,543 
Total cost36,777 35,412   
Less: Accumulated depreciation13,998 11,997 
Net property, plant, and equipment, net$22,779 $23,415 
Depreciation expense was $0.7 million and $2.2 million for the three and nine months ended September 30, 2020, respectively, and $0.7 million and $2.2 million for the three and nine months ended September 29, 2019, respectively.
Included in property, plant, and equipment,net are assets located in Mexico with a carrying amount of $3.8 million and $4.1 million at September 30, 2020 and December 29, 2019, respectively, and assets located in Canada with a carrying amount of $0.5 million and $0.6 million at September 30, 2020 and December 29, 2019, respectively.