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Features

Railroad Suspension Chair, Disappearance of a Nebula

Notes on Military and Naval Affairs

Polytechnic Association of the American Institute

Kepner's Feathering Paddle Wheels

The Great Troy Fire--Iron Safes Destroyed

The Best Gun

Proposed Amendments to the Canada Patent Law System

General Totten on the Ship and Fort Question

Extension of Patents--For Whose Benefit They Are Granted

The Way the Gold Deposits of California Were Formed

Patent Law Reform in New Brunswick

Recent American Inventions

Patent Claims

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May 31, 1862