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The equipment practice described and illustrated in this paper and referred to as Unit Construction Practice is based on the conception that the number of different circuit functions used in line-transmission technique is small and that these circuit functions can be performed by relatively few standardized components. Once these facts are recognized it is an obvious step to adopt an equipment practice in which a series of self-contained units, each comprising an assembly of standardized components and designed to perform a distinct circuit function, become the "bricks" which can be used in different combinations to build different types of systems. It is claimed that the new practice results in equipment which offers a degree of standardization combined with flexibility and a ready adoption to civil or military purposes not possible using earlier practices. Considerable space-saving is also effected.