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DEFERRED REVENUES - Summary of Deferred Revenues (Details) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred revenues, total | € 3,627 | € 3,205 |
Less long term portion | (926) | (1,313) |
Deferred revenues, current portion | 2,701 | 1,892 |
Maintenance [Member] |  |  |
Deferred revenues, total | 1,761 | 1,741 |
RPP [Member] |  |  |
Deferred revenues, total | 255 | 243 |
Sale of Devices [Member] |  |  |
Deferred revenues, total | 135 | 115 |
Extension of Warranty [Member] |  |  |
Deferred revenues, total | 782 | 837 | € 855
Research and Development Grants [Member] |  |  |
Deferred revenues, total | € 693 | € 269 |

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