In a handheld electronic device, a motor is controlled to adjust, according to input received at a user-input element of the device, an angle of rotation of a camera module about a rotation axis of the camera module. Models of the patient’s dentition, including the gingival and supporting bone structure are analyzed in relation to a model of the dentition that will be replaced by the implant. Even when brought into contact with the content solution exhibiting acidity of the fuel cell, the coil spring reliably suppresses the elution of metal ions thereof. The conductive layer is on the intermediate layer. The computational units include control units and execute units. , transferring incremental block-level changes.