A new and distinct cultivar of crapemyrtle, Lagerstroemia indica\xd7L. An electronic smoke detection unit, a light emitter and a light receiver are mounted on the printed circuit. A metallic string attachment member is secured to a free end of each of the springs. The error signal represents an enhanced speech signal having attenuated and normalized low-frequency noise components. Therefore, a difference in limiting torques of rotation between the clutch spring and the clutch wheel between when the clutch spring is not tightly wound on the clutch wall and when it is wound on the clutch wall is increased, without increasing a number of coils of the spring.