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REVENUE (Schedule of Contract Liabilities on Uncompleted Contracts) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Revenue |  |
Billings and/or cash receipts on uncompleted contracts | $ 3,861,055 | $ 2,978,007
Less: Costs and estimated earnings recognized | (3,411,559) | (2,268,454)
Contract liabilities | $ 449,496 | $ 709,553

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