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...

Alamo Falls, Texas Army Retreats

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

Churchill Expects Trouble from Nazis

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...

Arrested Alchemist Must Make Gold To Win Freedom

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

Lindbergh Takes Off On Transatlantic Flight

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

Inventors Wage Patent War

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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