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Inventories, net (Details) - Schedule of Inventory, Current - USD ($)
Dec. 31, 2021
Mar. 31, 2021
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 2,437,294 $ 2,912,599
Work-in-process 910,981 1,020,402
Finished goods 0 79,988
Less: Allowance for obsolete inventory (600,000) (575,000)
Inventory, net $ 2,748,275 $ 3,437,989