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DEFERRED REVENUES - Change in Deferred Revenue on Extension of Warranty (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance € 3,205  
Balance 3,627 € 3,205
Extension of Warranty [Member]    
Balance 837 855
New extension of warranty 206 254
Recognition of revenue (261) (272)
Balance € 782 € 837