Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷厄
.
利
太阳
开发电
传输信息。这种电从未商业生产。
·（电发明者）Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷厄.利太阳开发电传输信息。这种电从未商业生产。
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