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A group or set of inventions that are classified together because of common characteristics. Invention groups that include Agricultural, Communications, Computing, Energy, Transportation and more.

Agricultural History
Business History
Chemistry History
Communications History
Computing History
Energy History
Everyday Life History
     History of Apparel
     History of Food and Drink

     History of Household Items
     History of Toys and Games

     History of Office Equipment
Healthcare History
Instrument History
Transportation History
Weapons History

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