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Improved Evaporator

The Oil Regions of Pennsylvania

Notes on New Discoveries and New Applications of Science

Commencement of Polytechnic College of Pennsylvania

Miscellaneous Summary

Recent American Patents

Breaking of the Atlantic Cable

The Way the Distance was Measured to the Fault in the Atlantic Cable

Twenty Years Ago.--Volume I., Number 1

The Expansion Controversy

Patent Claims

Issued from the United States Patent-Office

Patent Agency Office


  • Departments


  • Patents

  • Notes and Queries

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