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
太阳光开发光
于传输信息。这种光从未于商业生产。
,光线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.贝尔利太阳光开发光于传输信息。这种光从未于商业生产。
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