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.贝尔利用太阳开发用于传输信息。这种未用于商业生产。
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.贝尔利用太阳开发用于传输信息。这种未用于商业生产。
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