Charles Babbage Invents Mechanical Calculator

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

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...

Pinkerton Suspects Socialite of Espionage

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 Organizes Bus Boycott

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

Earth May Revolve Around Sun

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

Paine Urges Americans To Declare Independence

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

Steam Power Moves Ancient Monument

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

Anesthesia Makes Surgery Painless

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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