The present invention relates to a coaxial cable having a flat portion, so that the cable can be used, for example, as a jumper cable that passes through a window sill or a door. Sliced bread is conveyed in a standing state by a sliced bread feed-in conveyor to be fed in a first supply path conveying the sliced bread of one pound in the standing state, or in a second supply path conveying the sliced bread of a half pound in the standing state. The modified Ti plasmid is then used to transform recipient plant cells.