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Drop Forging of Tool Steel

An Accident on the Great Bridge

Aspects of the Planets for June

A Novel Air Motor

Improved Water Heater

Atmospheric Dust and Germs

Fire and Burglar Proof Safes

Electric Lighting on the Arizona

The Helmet Cassowary

Agricultural Inventions

Mechanical Inventions

Miscellaneous Inventions

Engineering Inventions


  • Departments


  • Recent Inventions

  • New Books and Publications

  • Notes and Queries

  • Business and Personal

  • Index of Inventions

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