The invention relates to a device for locking and unlocking the roller shutter of a container that can be inserted into a rack and removed therefrom. The fluid turbine comprises a phase-adjustable mechanism operable to control the pitch angle of at least one rotor blade about its pitch axis and to vary the pitch angle of the rotor blade between various pitch angles as the blade moves radially about the axis of rotation of the rotor. The SAF free layer may be used with a SAF reference layer in STT-MRAM memory elements or in spintronic devices including a spin transfer oscillator. After the prescribed time elapses, the initializing process in the lens device is started.