Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷.尔利太阳开发电话输信息。这种电话从未商业生产。
Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷.尔利太阳开发电话输信息。这种电话从未商业生产。
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