Monday, September 16, 2019

English Gentleman Invents Photography

The model department of the United States Patent Office in Washington is illuminated here and there with the original models of the very great...

Professor W.C. Röntgen Discovers X-Rays

The model department of the United States Patent Office in Washington is illuminated here and there with the original models of the very great...

Chester Carlson Invents Machine To Copy Documents

The model department of the United States Patent Office in Washington is illuminated here and there with the original models of the very great...

Printer Invents Typewriting Machine

The model department of the United States Patent Office in Washington is illuminated here and there with the original models of the very great...

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