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Improved Field Fortification, Naval Observatories, and More

Miscellaneous Summary

American and English Cast-Iron Guns

Scientific Information--British Association for the Advancement of Science

Sage's Yeast Riser

Mechanics Masters of the World

Beam Engines

Educating Youth for Scientific Pursuits

Greek Fire--Shell and Shot

The Ghost on Trial and Patented

American Wool and Woolen Manufactures

Recent American Patents

Patent Claims

Issued from the United States Patent-Office

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