sentences:  This was the type used at Kaiser-Wilhelm-Koog, Germany, where a large experimental two-bladed unit—the GROWIAN, or "Große Windkraftanlage" (big wind turbine)—operated from 1983 to 1987.Other prototypes and wind turbine types were manufactured by NedWind.The Eemmeerdijk Wind Park in Zeewolde, Netherlands uses only two-bladed turbines.