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.贝尔阳开话于传输信息。这种话从未于商业生产。
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.贝尔阳开话于传输信息。这种话从未于商业生产。
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