Problems of dot pattern technology include latitudelongitude information not being able to be acquired from a curvilinear solid. A model-based OPC is performed on each of the plurality of sub graphic patterns by moving sides of the sub graphic pattern in directions parallel to coordinate axes of the orthogonal coordinate system assigned to the sub graphic pattern. The magnifier housing being adjustable to provide the lens and reading material to be properly aligned for viewing. A transmission mechanism is mounted on the body frame and is connected to the motor shaft for transmitting a driving power of the electric motor to the cultivating members via the cultivating shaft. The tag typically includes a protocol detector 120 which is operable to detect receipt of an RTF protocol communication signal and to suspend transmission when the electronic tag receives an RTF protocol communication signal from a reader.