International Conference on the Internal and External Protection of Pipes International Conference on the Internal & External protection of Pipes (Noordwijkerhout)International Conference on the Internal ��� External protection of Pipes Proceedings of the 1st International Conference on the Internal and External Protection of Pipes.Sept.9-11,1975,Durham International conference on devlopemnts in power system protection International Conference on the Hydraulic Transport of Solids in Pipes International conference on Developments in power system protection international conference on higher education reform in China International conference on the applications of artifcial intelligence in engineering 3rd international conference on antennas and propa