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日本电报电话公司从1984年4月开始发售一种启开信封就能放出“生日愉快”旋律的庆贺用电报纸。这种电报的特点,是在电报纸上安装了一种薄型电子八音盒。收报人打开电报时,它就可根据装在基盘上的光传感器(光电元件)的开关的动作
Since April 1984, Nippon Telegraph and Telephone Corporation has started selling a celebrating newspaper with a “happy birthday” melody opening the envelope. The feature of this type of telegraph is the installation of a thin electronic music box on the newspaper. The receiver opens the telegram, it can be based on the light sensor mounted on the base plate (photoelectric element) switch action