An articulated cutting head and conveyor mount for sod harvesting machines. Each pinion has a planetary gear engaged with the sun gear, and planetary gears having the number of teeth different from that of that planetary gear. The second processor receives the encrypted content and in one embodiment, also uses the same decryption engine to decrypt the encrypted content. The images, placed in parallel along the walls of the pathway of the vehicle, are adapted in number, size, and spacing for a vehicle travelling at the known speed and at the known distance from images on one or both sides of the vehicle such as to maintain an approximately constant viewing rate and perceived size of the images. The method feeds the fuel into a bowl coated with a thermal insulation coating in at least two successive injections in quick succession to achieve low-temperature combustion of the fuel mixture. A first shieldconcentrator of a material exhibiting a substantial magnetic permeability is positioned between the substrate and the first input conductor.