Joint International Symposium on Data Communications Technology and Practice,Sydney,1976 Joint International Symposium "Data Communications Technology and Practice",Sydney,Aug.24-26,1976 (Tokyo)International Symposium on Space Technology and Science International Symposium on Space Technology and Science 1958 fifth national symposium on vacuum technology transactions International Symposium on Gas Separation Technology Digital identity authentication technology and practice International Symposium on Global Communications,6th,Philadelphia,1964 1957 Fourth national symposium on vacuum technology transactions 1960 seventh national symposium on vacuum technology transactions