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Property, plant and equipment, net | 12 Months Ended
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Dec. 31, 2021
Property, plant and equipment, net |
Property, plant and equipment, net | Note 9 – Property, Plant and Equipment, net Property, plant and equipment stated at cost less accumulated depreciation consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Building | ​ | $ | 5,228,347 | ​ | $ | 5,631,049
Machinery and Production equipment | ​ |  | 1,307,356 | ​ |  | 1,311,624
Electronic equipment | ​ |  | 203,305 | ​ |  | 193,912
Office equipment | ​ |  | 48,440 | ​ |  | 38,524
Automobiles | ​ |  | 545,006 | ​ |  | 545,008
Construction in progress | ​ |  | 343,401 | ​ |  | 133,339
Subtotal | ​ |  | 7,675,855 | ​ |  | 7,853,456
Less: Accumulated depreciation | ​ |  | (5,571,908) | ​ |  | (5,375,544)
Property, plant and equipment, net | ​ | $ | 2,103,947 | ​ | $ | 2,477,912
​ Depreciation expense was $444,462, $436,427 and $703,113 for the years ended December 31, 2021, 2020 and 2019, respectively, among which $444,462, $436,427 and $462,639 were for continuing operations, respectively. As of December 31, 2021 and 2020, building with net book value of $588,063 and $895,742 respectively, were pledged as collateral for bank loans (Note 12).

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