Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
大.格雷厄姆.贝尔利用太阳
开发电话用于传输信息。这种电话从未用于商业
产。
大·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.
大.格雷厄姆.贝尔利用太阳开发电话用于传输信息。这种电话从未用于商业产。
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