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Intangible assets, net (Details 2) - ZHEJIANG TIANLAN - CNY (¥)
¥ in Thousands
Dec. 31, 2023
Dec. 31, 2022
2024 ¥ 246  
2025 246  
2026 246  
2027 246  
2028 246  
Thereafter 533  
Total ¥ 1,763 ¥ 1,808