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The basic components of the data-transmission system described above have been in operation for over a year and have given satisfactory service. There has been practically no change in the original choice of components. They were chosen because of their known reliability and stability and for the purpose of having the system operational as Soon as possible. The maintenance required has been reasonable (chiefly the usual replacemenlt of tubes). In the light of the advancement of transistorized circuits, it is advisable to incorporate such circuits into any future redesign. This would, no doubt, have the additional advantages of conserving space and reducing power onsumption.