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INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2021
INTANGIBLE ASSETS |
INTANGIBLE ASSETS | NOTE 12 — INTANGIBLE ASSETS Intangible assets consist mainly of relationships with customers and suppliers recognized upon business combinations and software development, with application in the management of the business: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Customer |  | ​ |  | ​
​ | ​ | Supplier | ​ | Software | ​ | contracts and | ​ | ​ | ​ | ​
​ | ​ | relationships | ​ | development | ​ | relationships | ​ | Others | ​ | Total
Balance as of January 01, 2019 |  | 26,719 |  | 415,640 |  | 387,299 |  | 6,438 |  | 836,096
Foreign exchange effect |  | — |  | 6,137 |  | 12,586 |  | 472 |  | 19,195
Acquisition |  | — |  | 100,313 |  | — |  | — |  | 100,313
Amortization |  | (5,304) |  | (157,278) |  | (116,462) |  | (3,298) |  | (282,342)
Balance as of December 31, 2019 |  | 21,415 |  | 364,812 |  | 283,423 |  | 3,612 |  | 673,262
Foreign exchange effect |  | — |  | 42,890 |  | 83,806 |  | 1,074 |  | 127,770
Acquisition |  | — |  | 154,250 |  | — |  | — |  | 154,250
Amortization |  | (4,637) |  | (188,083) |  | (136,525) |  | (3,459) |  | (332,704)
Balance as of December 31, 2020 |  | 16,778 |  | 373,869 |  | 230,704 |  | 1,227 |  | 622,578
Foreign exchange effect |  | — |  | 17,609 |  | 13,247 |  | 33 |  | 30,889
Acquisition |  | — |  | 166,310 |  | — |  | — |  | 166,310
Amortization |  | (4,055) |  | (177,674) |  | (127,028) |  | (1,260) |  | (310,017)
Balance as of December 31, 2021 |  | 12,723 |  | 380,114 |  | 116,923 |  | — |  | 509,760
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Estimated useful lives |  | 5 to 20 years |  | up to 5 years |  | 5 to 20 years |  | 5 years |  |
​ The composition of other intangible assets by segment is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019
Brazil |  | 207,053 |  | 220,303 |  | 238,243
Special Steel |  | 130,719 |  | 156,557 |  | 132,934
South America |  | 1,039 |  | 1,534 |  | 1,729
North America |  | 170,949 |  | 244,184 |  | 300,356
​ |  | 509,760 |  | 622,578 |  | 673,262
​

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