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Accounts receivable, net (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounts receivable, net |
|  | 2021 |  |  | 2020 |
|  | US$’000 |  |  | US$’000 |
Contract receivables |  |  | 3,661 |  |  |  | 3,229 |
Less: allowance for doubtful accounts |  |  | (30 | ) |  |  | (30 | )
|  |  | 3,631 |  |  |  | 3,199 |
Allowance for doubtful accounts activity |
|  | 2021 |  |  | 2020 |
|  | US$’000 |  |  | US$’000 |
Balance at beginning of period |  |  | 30 |  |  |  | 36 |
Less : reversal in allowances |  |  | - |  |  |  | (6 | )
Balance at end of period |  |  | 30 |  |  |  | 30 |
Age analysis of past due account receivables |
|  | 2021 |  |  | 2020 |
|  | US$’000 |  |  | US$’000 |
Current |  |  | 1,441 |  |  |  | 2,014 |
Past due |  |  |  |  |  |  |  |
1-30 days |  |  | 1,570 |  |  |  | 85 |
31-60 days |  |  | 495 |  |  |  | 202 |
61-90 days |  |  | 108 |  |  |  | 41 |
Greater than or equal to 91 days |  |  | 17 |  |  |  | 857 |
|  |  | 2,190 |  |  |  | 1,185 |
|  |  | 3,631 |  |  |  | 3,199 |
ZHEJIANG TIANLAN |
Accounts receivable, net |
|  | 2021 |  |  | 2020 |
|  | RMB’000 |  |  | RMB’000 |
Contract receivables |  |  | 148,889 |  |  |  | 160,803 |
Less: allowance for doubtful accounts |  |  | (42,867 | ) |  |  | (42,182 | )
|  |  | 106,022 |  |  |  | 118,621 |
Allowance for doubtful accounts activity |
|  | 2021 |  |  | 2020 |
|  | RMB’000 |  |  | RMB’000 |
Balance at beginning of period |  |  | 42,182 |  |  |  | 26,484 |
Add: provision for allowances |  |  | 868 |  |  |  | 22,161 |
Less: Reversal of provision for doubtful accounts |  |  | (183 | ) |  |  | (6,463 | )
Balance at end of period |  |  | 42,867 |  |  |  | 42,182 |
Age analysis of past due account receivables |
|  | 2021 |  |  | 2020 |
|  | RMB’000 |  |  | RMB’000 |
Within 1 year |  |  | 82,534 |  |  |  | 76,590 |
1 year - 2 years |  |  | 12,144 |  |  |  | 31,389 |
2 years - 3 years |  |  | 5,111 |  |  |  | 6,128 |
3 years - 4 years |  |  | 5,141 |  |  |  | 3,678 |
4 years - 5 years |  |  | 1,092 |  |  |  | 836 |
|  |  | 106,022 |  |  |  | 118,621 |

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