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Inventories (Details) - Schedule of Inventory, Current - USD ($)
Mar. 31, 2020
Mar. 31, 2019
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 3,011,072 $ 2,709,235
Work-in-process 597,166 721,397
Finished goods 34,441 0
Less: Allowance for obsolete inventory (550,000) (498,000)
Inventory, net $ 3,092,679 $ 2,932,632