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