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Intangible assets, net (Details) - ZHEJIANG TIANLAN - CNY (¥) ¥ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Patents	¥ 2,400	¥ 2,400
Others	165	575
Intangible assets, gross	2,565	2,975
Less: accumulated amortization	(1,638)	(1,896)
Intangible assets, net	¥ 927	¥ 1,079

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Gross carrying amount before accumulated amortization as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights.

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