Vertical and horizontal wind shears, yaw misalignment andor turbulence act together to produce asymmetric loading across a wind turbine rotor. When a telephone call is placed from the wireless telephone, an alias database is searched to determine the associated wired telephone number. An antenna may be located in an upper right corner of the handheld device as the handheld device is operated in a portrait mode. Alignment work of the link plate with respect to the output shaft becomes unnecessary at a time of the replacement work of the wiper motor, and maintainability can be significantly improved without decreasing positional accuracy of wiper members with respect to a front glass. Consequently, the projection-type video display apparatus becomes compact and has improved contrast. Other embodiments are also described.