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Segment information and revenue analysis (Details 2) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
REVENUES $ 1,437,848 $ 280,000
Mainland China [Member]      
REVENUES 1,417,848 2,589,823 5,505,734
Outside Mainland China [Member]      
REVENUES 20,000 280,000
Total Revenues [Member]      
REVENUES $ 1,437,848 $ 2,869,823 $ 5,505,734