Introduction to old records: The third floor is mainly divided into six exhibition areas for phonographs, records, cassette players, televisions, telephones and mobile phones. Among them, the more commemorative ones include: China's self-produced gramophone inscribed by Lin Biao, the world's largest mobile phone, military mobile phones during the Vietnam War, some extremely rare old wall-mounted wooden box telephones from the second half of the 19th century, and The giant gramophone used in the old Shanghai Paramount Dance Hall and so on.