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The railroad and barbed wire fences.
Probably not. Better to hire an attorney if you think you have a marketable invention.
The invention is... the window!
Agriculture in Nigeria can be improved through the adoption of responsible farming practices like terracing and crop rotation. Also, it can be improved by educating farmers on how to prevent soil erosion.
helping famers fight for better prices (apex)
farmers land is grabbed farmers land is grabbed
A door. A chainsaw
Windows
Radar-1922 Recoder-1927
A power drill
A Window
The most important invention of the Sumerian's was Irrigation. Irrigation is how the Sumerian's led their water through pipes, etc.