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Inventories (Details) - USD ($) | Oct. 31, 2021 | Apr. 30, 2021
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 1,033,801 |
Work-in-process | 176,522 |
Finished goods | 775,184 | 362,072
Total | $ 1,985,507 | $ 362,072

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