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<p>only one message may be in transit in the network, the sequential order of messages is preserved end-to-end. In the early 1970s, the British Post Office developed the concept of "virtual calls" for its experimental EPSS network but the protocols were complex and limited. <a href="page.php?w=R%C3%A9mi_Despr%C3%A9s">Rémi Després</a> formalized the concept of virtual circuits and validated it on the French <a href="page.php?w=RCP_%28Packet_switching%29">RCP</a> experimental network with his team at <a href="page.php?w=Centre_national_d%27%C3%A9tudes_des_t%C3%A9l%C3%A9communications">CNET</a>.</p><p>
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