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Features

Machine for Rifling Gun Barrels

Influence of Food Upon the Intellect

Miscellaneous Summary

American Armor Plates

The Great Naval Controversy

The Camphor Storm-Glass

Hard Boiling

The World's Indebtedness to Science

Special Notices

Comparison Between American and English Taxes

Recent Southern Intelligence

Patent Claims

To Our Readers

Recent American Patent

Patents Granted for Seventeen Years!

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February 20, 1864

See the World from a Different Perspective

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