| 摘要 |
A bill board apparatus for displaying multiple messages from a plurality of message segments. A series of message segments are arranged upon an axis so as to form a complete display message by a minimum of two segments. A swing arm or actuator arm that is in conection with the first sign segment of the plurality of segments turns each segment 180° in order to display a different message when the time has come to display a new message. A computer may be used to actuate the actuator and this may be programmed so as to display different messages for different lengths of time.
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