Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历.雷厄姆.贝尔利用太阳开发电话用于传输。种电话从未用于商业生产。
Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历.雷厄姆.贝尔利用太阳开发电话用于传输。种电话从未用于商业生产。
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