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This paper is a description of the "unitized" principle of radio construction, written in the interest of historical records, since it is quite radical in design and has been developed to a high degree of refinement. A receiver built of "unitized" parts will consist of a number of subunits which are assembled on two identical sheet-metal chassis, and all fall under three general classifications, namely, radio frequency, intermediate frequency, or audio cells. A detailed description of each cell type, as well as contingencies arising from their use in groups, is given. While "unitized" construction is primarily a mechanical development, certainly no compromise in quality need be accepted in the electrical performance of the unit. Indeed, an electrical advance has been achieved in the improved use of shielding and unique arrangement of parts which "unitizing" permits.