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Improvement in the Steam Engine

Notes on Military and Naval Affairs

Polytechnic Association of the American Institute

Hunter's Army and Travelers' Compass

Ludlow's Sliding Stop Valve

The Craig Microscope

Grease and India Rubber

Torpedoes to Destroy Vessels

Printing in Colors

A Good Move in Life Insurance

Americans at the Great English Exhibition

Revolving Turrets for Barbette Guns

Recent American Inventions

Patents Claims

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