13 companies with NACE 3521 - in Bucuresti 3 companies with NACE 3521 - in Bacau 3 companies with NACE 3521 - in Bihor 2 companies with NACE 3521 - in Giurgiu 2 companies with NACE 3521 - in Botosani 2 companies with NACE 3521 - in Constanta 2 companies with NACE 3521 - in Sibiu 1 companies with NACE 3521 - in Dolj 1 companies with NACE 3521 - in Ilfov 1 companies with NACE 3521 - in Prahova 1 companies with NACE 3521 - in Salaj 1 companies with NACE 3521 - in Buzau 1 companies with NACE 3521 - in Timis 1 companies with NACE 3521 - in Cluj 1 companies with NACE 3521 - in Dambovita