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<p>The ARPANET, which came to life near the end of 1969, had grown to 29 nodes by August 1972. Other packet research projects were underway in Britain and France. Several national post, telephone, and telegraph (PTT) organizations were beginning to consider building national common-user data networks using packet-switching technology. These included the British Post Office's Experimental Packet Switched System (EPSS), RCP (French PTT), and a small experimental packet-switched network (PSN) built by the Norwegian PTT during 1971 to 1972 and used for experiments for three months. The people responsible for all these networks converged on the first International Conference on Computer Communication held in Washington D.C. during October 1972. With a push from Larry Roberts of DARPA, a group of network designers met to talk about how all these networks could be interconnected. On 24 October, these designers met to form what they called the International Packet Network Working Group (INWG).</p>
History of computing, post, telephone, and telegraph (PTT) organizations, ARPANET, DARPA, INWG

A. McKenzie, "INWG and the Conception of the Internet: An Eyewitness Account," in IEEE Annals of the History of Computing, vol. 33, no. , pp. 66-71, 2011.
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