A Most Valuable Idea

The history of patent law shows its great and enduring power.

Appeared in: Volume 5, Number 3 | Published on: January 1, 2010
William Rosen is the author of Justinian’s Flea: The First Great Plague and the End of the Roman Empire. His new book, The Most Powerful Idea in the World: A Story of Steam, Industry, and Invention, will be published by Random House in May.
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