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电话发展史

电话发展史. 张燕. 1878 年手持电话. 贝尔电话. 1881 ， 1882 ，磁力发电机壁式电话. 1885 ，“埃菲尔铁塔”磁力发电机电话. 1892 年，带听筒的“埃菲尔铁塔式”电话. 1893 年，“咖啡壶式”电话. 1900 年，直立桌式电话. 数字机械式墙式电话. 1902 年，公用电池墙式电话. 电动折叠式桌面电话.

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电话发展史

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  1. 电话发展史 张燕

  2. 1878年手持电话

  3. 贝尔电话

  4. 1881，1882，磁力发电机壁式电话

  5. 1885，“埃菲尔铁塔”磁力发电机电话

  6. 1892年，带听筒的“埃菲尔铁塔式”电话

  7. 1893年，“咖啡壶式”电话

  8. 1900年，直立桌式电话

  9. 数字机械式墙式电话 1902年，公用电池墙式电话

  10. 电动折叠式桌面电话

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