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Semina con elicottero A2 Lopper, Hergiswil/NW
Oggetto
A2 Lopper Hergiswil NW
Committente
USTRA, Ufficio federale delle strade
Lavori eseguiti
Semina in zona inaccessibile tramite elicottero e benna speciale.
Materiali utilizzati
Miscuglio di semina preconfezionato con sementi, sostanze collanti e nutritive.
Data di attuazione
2010/2011