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Intangible assets, net | 12 Months Ended
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Dec. 31, 2018
ZHEJIANG TIANLAN |
Intangible assets, net |
|  | 2018 |  |  | 2017 |
|  | RMB’000 |  |  | RMB’000 |
Patents |  |  | 2,400 |  |  |  | 2,400 |
Others |  |  | 575 |  |  |  | 567 |
|  |  | 2,975 |  |  |  | 2,967 |
Less: Accumulated amortization |  |  | (1,896 | ) |  |  | (1,744 | )
|  |  | 1,079 |  |  |  | 1,223 |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | RMB’000 |  |  | RMB’000 |  |  | RMB’000 |
Amortization expense |  |  | 152 |  |  |  | 152 |  |  |  | 575 |
The useful lives of intangible assets, net of the Group are normally 10-20 years. The following table represents the total estimated amortization of intangible assets, net for the five succeeding fiscal years to December 31, 2018:
For the Twelve Months Ending December 31, |  | Estimated Amortization Expenses |
|  | RMB’000 |
2019 |  |  | 152 |
2020 |  |  | 152 |
2021 |  |  | 152 |
2022 |  |  | 152 |
2023 |  |  | 152 |
Thereafter |  |  | 319 |
|  |  | 1,079 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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