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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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