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Christensen's Patent Rotary Engine

The Plague or Black Death

Miscellaneous Summary

Theory and Practice

Sea Fogs and Signals

The Broadway Railroad

Paint for Iron Ships

The Patent Office Report for 1861

Changes in the Iron-Clads

Valuable Receipts

The Manufacture of Carriages

Patent Claims

Issued from the United States Patent Office

Recent American Patents


  • Departments


  • Notes and Queries

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