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Features

Excavating and Dredging Apparatus

“Labor and Education”

Aspects of the Planets for October

Automatic Safety Appliances

Improved Plow

The Western Union Underground Systems

Improved Safety Valve

Improved Sash Balance

New Spanish War Steamers

Improved Filter

Improved Fire Escape

Sad-Iron Holder

Improvement in Dust-Pans

Pyrethrum, or Chrysanthemum Corymbosum

Mechanical Inventions

Miscellaneous Inventions

Engineering Inventions

Agricultural Inventions

Departments

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    Correspondence

  • Recent Inventions

  • Index of Inventions

  • Business and Personal

  • New Books and Publications

  • Notes and Queries

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September 29, 1883

Beyond XX and XY

Biology. Identity. Equality.