我的一个选择是来自史密斯森国家历史博物馆的专利模型:塞缪尔·莫尔斯(Samuel Morse)1849年设计的收报机;
One of my requests was for patent models from the Smithsonian National Museum of American History: Samuel Morse's 1849 design for a telegraph register;
我的一个选择是来自史密斯森国家历史博物馆的专利模型:塞缪尔·莫尔斯(Samuel Morse)1849年设计的收报机;
One of my requests was for patent models from the Smithsonian National Museum of American History: Samuel Morse's 1849 design for a telegraph register;
应用推荐