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REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Contract assets | $ 4,504,621 | $ 4,390,832
Unbilled |  |
Contract assets | 10,635,588 | 9,324,361
Less: Progress payments |  |
Contract assets | $ (6,130,967) | $ (4,933,529)

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