In an embodiment of the invention an application provider may include \u201ctracing elements\u201d in a target software application. A odor air sensor is mounted in the opening for detecting the presence of odor air expelled by the person. The forklift rear section mounts a pair of drive wheels. The connection component is connected to a portable electronic device. In the formula, Ra and Rb each independently represent a hydrogen atom, a halogen atom, a linear or branched alkyl group, a cycloalkyl group, an aryl group or an alkoxy group, or Ra and Rb may be bonded to each other to form a ring; R1 to R4 each independently represent a hydrogen atom, a halogen atom or an alkyl group; and n represents an integer of 0 to 30. The damping bell also includes a bell wall that extends about the intake opening and the damping panel in a collar-like manner.