The invention relates to a non-human multicellular organism carrying a dominant lethal genetic system, the lethal effect of which is conditional, wherein the lethal effect of the lethal system occurs in the natural environment of the organism. Crown shapes of the first and second rolls include inclined areas that are inclined with respect to rotation axes of the first and second rolls. Battery cans formed during the process are also described. The portable accessory mounting system may be dismounted from the front wall using thrust that is away from the floor.