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Contract Assets and Contract Liabilities (Details 1) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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Costs and estimated earnings amounts on uncompleted contracts included in balance sheets |  |
Contract assets | $ 11,830 | $ 106,015
Contract liabilities | (148,851) | (168,957)
Net contract liabilities | $ (137,021) | $ (62,942)

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