A magnetic field sensor uses upper and lower thresholds. The device is especially designed to be applied to or integrated in an anti-radiationanti-staticanti-reflection filter intended to block the aforementioned emissions, particularly in devices with cathode ray tubes. Moreover, a full frame picture includes a plurality of subframes. The cutter cuts the web of strands, producing a quantity of decorative grass, which is then divided into discrete aggregates and sent by ducts to bagging assemblies, each of which has a rotatable turret having magazines for receiving and discharging discrete aggregates, an inserter and a bag handler. The sterilization method may comprise a combination of gaseous, liquid and light sterilization. A second cooling hose is coupled to the motor housing outlet and coupled to the compressor inlet.