A powder spray system comprises a plurality of supply hoppers, a purge air supply, a manifold operably connected to each of the plurality of supply hoppers, and a spray gun. The device also compares the cost factor to a threshold, and receives, from one or more of the STB or the user device, a request for free video content. By positioning interference signal generating traces like writer traces on one side of the slit, that side becomes the noisy ground path leaving the other side as a \u201cquiet\u201d ground path. The pre-stretch rollers may be coated. A shape memory actuator is started through an electric current passage for causing the displacement of the cam means in a position wherein they permit the backward movement of the two stop elements towards a mutual close position. The invention further relates to methods for producing the lettuce cultivar, represented by lettuce variety 79-88 RZ, representative seed having been deposited under NCIMB Accession No.