Discover your family history in millions of family trees and more than 11 billion birth, marriage, death, census, and military records. Search historical records. Discover your family history in millions of family trees and more than 11 billion birth, marriage, death, census, and military records. Search historical records. Start a free family tree online and let us do the searching for you! You'll get hints when we find info that matches your relatives. Start a FREE family tree.
invention category 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.
It also does not include technologies developed elsewhere and later invented separately by the Chinese, such as the odometer and chain pump. Scientific, mathematical or natural discoveries, changes in minor concepts of design or style and artistic innovations do not appear on the list.