Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷.尔利用太阳光开发光电用于传输信息。这种光电从未用于商业生产。
Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷.尔利用太阳光开发光电用于传输信息。这种光电从未用于商业生产。
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