Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚
.格雷厄姆.贝尔利用太阳
开发电话用于传输信
。
电话从未用于商业生产。
·格雷厄姆·贝尔（电话发明者）Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚.格雷厄姆.贝尔利用太阳开发电话用于传输信。电话从未用于商业生产。
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