Before revision: Examples include RETD in Spain, the first public network in 1972; RCP in France also in 1972; Telenet in the United States, which began operation with proprietary protocols in 1975; EIN in the EEC in 1976; and EPSS in the United Kingdom in 1977.
After revision: Examples include RETD in Spain, the first public network in 1972; RCP in France also in 1972; Telenet in the United States, which began operation with proprietary protocols in 1975; EIN in the EEC in 1976; and EPSS in the United Kingdom in