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PROPERTY AND EQUIPMENT | 12 Months Ended
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Sep. 30, 2022
PROPERTY AND EQUIPMENT |
PROPERTY AND EQUIPMENT | 5. PROPERTY AND EQUIPMENT Property and equipment as of September 30, 2022 and 2021 was comprised of the following:
|  | Estimated Useful Lives |  | September 30, 2022 |  |  | September 30, 2021 |
Machinery and equipment |  | 2-3 years |  | $ | 1,510,265 |  |  | $ | 654,798 |
Leasehold improvements |  | 5 years |  |  | 3,612 |  |  |  | 3,612 |
Furniture and fixtures |  | 5 years |  |  | 26,855 |  |  |  | 26,855 |
Less: accumulated depreciation |  |  |  |  | (677,755 | ) |  |  | (356,761 | )
|  |  |  | $ | 862,977 |  |  | $ | 328,504 |
Total depreciation expense was $320,995 and $99,693 for the years ended September 30, 2022 and 2021, respectively. All equipment is used primarily for research and development purposes and accordingly $304,637 in depreciation is classified in research and development expenses during the year ending September 30, 2022.

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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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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