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The history of packet-switched networks can be divided into three overlapping eras: early networks before the introduction of X.25; the X.25 era when many postal, telephone, and telegraph (PTT) companies provided public data networks with X.25 interfaces; and the Internet era which initially competed with the OSI model. [145] [146] [147]
There has been much study on human-inspired walking, such as AMBER lab which was established in 2008 by the Mechanical Engineering Department at Texas A&M University. [73] Many other robots have been built that walk on more than two legs, due to these robots being significantly easier to construct.