Apparatus and methods related to wind turbine blades and manufacturing of the blades. The panels may be centrally milled along all edges suitable for accepting spline brackets along the vertical edges thereby constructing wall faces. The router receives a packet for forwarding to a destination address in an address space of the subnet according to the IPv6 protocol and looks up the destination address in a Neighbor Discovery table. The PCM modulator converts a voice signal received from the terminal 3c to PCM data. The connectors and the rods are mutually arranged and mounted in order to effect, from one level to the other, an essentially identical angular positioning of the common rods and an angular offset of the other rods. Each of the memory cells includes a channel region, in which current flows in a direction perpendicular to a surface of the semiconductor substrate, a charge accumulation region provided along the channel region, and an insulator film provided between the channel region and the charge accumulation region.