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15. Inventories | 12 Months Ended
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Dec. 31, 2018
Inventories Abstract |
Inventories |
|  | 12.31.18 |  | 12.31.17
Current |  |  |  |
Supplies and spare-parts |  | 1,252,292 |  | 589,339
Advance to suppliers |  | 7,507 |  | 60,241
Total inventories |  | 1,259,799 |  | 649,580

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