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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2019
Accounts receivable, net | Accounts receivable, net consisted of the following at December 31:
|  | 2019 |  |  | 2018 |
|  | US$’000 |  |  | US$’000 |
Contract receivables |  |  | 3,622 |  |  |  | 5,201 |
Less: allowance for doubtful accounts |  |  | (36 | ) |  |  | (112 | )
|  |  | 3,586 |  |  |  | 5,089 |
The roll-forward of activity in the allowance for doubtful accounts was as follows for the years ended December 31:
|  | 2019 |  |  | 2018 |
|  | US$’000 |  |  | US$’000 |
Balance at beginning of period |  |  | 112 |  |  |  | 109 |
(Less) / add: (reversal in) / provision for allowances |  |  | (76 | ) |  |  | 3 |
Balance at end of period |  |  | 36 |  |  |  | 112 |
The following is an aging analysis of accounts receivable, net at December 31:
|  | 2019 |  |  | 2018 |
|  | US$’000 |  |  | US$’000 |
Current |  |  | 1,495 |  |  |  | 4,485 |
Past due |  |  |  |  |  |  |  |
1-30 days |  |  | 41 |  |  |  | 200 |
31-60 days |  |  | 1,343 |  |  |  | 38 |
61-90 days |  |  | 99 |  |  |  | 17 |
Greater than or equal to 91 days |  |  | 608 |  |  |  | 349 |
|  |  | 2,091 |  |  |  | 604 |
|  |  | 3,586 |  |  |  | 5,089 |
ZHEJIANG TIANLAN |
Accounts receivable, net | Accounts receivable, net consisted of the following at December 31:
|  | 2019 |  |  | 2018 |
|  | RMB’000 |  |  | RMB’000 |
Contract receivables |  |  | 165,262 |  |  |  | 177,632 |
Less: allowance for doubtful accounts |  |  | (26,484 | ) |  |  | (24,047 | )
|  |  | 138,778 |  |  |  | 153,585 |
The roll-forward of activity in the allowance for doubtful accounts was as follows for the years ended December 31:
|  | 2019 |  |  | 2018 |
|  | RMB’000 |  |  | RMB’000 |
Balance at beginning of period |  |  | 24,047 |  |  |  | 41,761 |
Add/(less): provision for/(reduction in) allowances |  |  | 2,437 |  |  |  | (17,714 | )
Balance at end of period |  |  | 26,484 |  |  |  | 24,047 |
The following is an aging analysis of accounts receivable, net at December 31:
|  | 2019 |  |  | 2018 |
|  | RMB’000 |  |  | RMB’000 |
Within 1 year |  |  | 96,456 |  |  |  | 119,233 |
1 year - 2 years |  |  | 30,252 |  |  |  | 21,182 |
2 years - 3 years |  |  | 6,260 |  |  |  | 9,492 |
3 years - 4 years |  |  | 5,179 |  |  |  | 3,225 |
4 years - 5 years |  |  | 631 |  |  |  | 453 |
|  |  | 138,778 |  |  |  | 153,585 |
At December 31, 2019, the accounts receivable, net pledged as security for the Company’s bank loans and third party loans amounted to approximately RMB11,575,000 (2018: RMB21,634,000).

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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