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