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
太阳
开发
于传输信息。这种从未于商业生产。
（发明者）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.贝太阳开发于传输信息。这种从未于商业生产。
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