Then, the advent of paper written in China in the second century and in Europe in centuries XI-XII has really created a revolution in the exchange of mail. Over time, the demands of larger corresponded, and this demand is especially increased when the international trade development. Around the seventeenth century and the EIGHTEENTH, the bilateral agreement about the postal service began to be signed between the countries. Song to the nineteenth century, the network of bilateral agreements is becoming complex and started hindering the rapid development of trade. It needs to have the new rules for forwarding to the international postal service.
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