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Contract Assets and Contract Liabilities (Details 1) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Costs and estimated earnings amounts on uncompleted contracts included in balance sheets |  |
Contract assets | $ 484,622 | $ 1,303,136
Contract liabilities | (1,176,180) | (1,774,740)
Net contract assets (liabilities) | $ (691,558) | $ (471,604)

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