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Property, plant and equipment, net | 12 Months Ended
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Sep. 30, 2021
Property, plant and equipment, net. |
Property, plant and equipment, net | Note 7 — Property, plant and equipment, net Property, plant and equipment from the Company’s continuing operations, stated at cost less accumulated depreciation, consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of
​ |  | September 30, |  | September 30,
​ | ​ | 2021 | ​ | 2020
Plant, machinery and equipment | ​ | $ | 70,113 | ​ | $ | 12,351
Transportation equipment | ​ |  | 54,362 | ​ |  | 51,450
Office equipment | ​ |  | 21,474 | ​ |  | 16,711
Sub-total | ​ |  | 145,949 | ​ |  | 80,512
Accumulated depreciation | ​ |  | (66,467) | ​ |  | (41,643)
Total | ​ | $ | 79,482 | ​ | $ | 38,869
​ Depreciation expense was $22,332, $22,474 and $32,983 for the years ended September 30, 2021, 2020 and 2019, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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