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The requirements for greater miniaturization, higher operating temperature capability, and better moisture protection have resulted in the development of new constructional techniques for electronic transformers. The developments in application of new materials and techniques are detailed. Among the new developments discussed are the application of fluorochemicals to transformers designed for maximum coil temperatures of 200°C.; the philosophy of "controlled environment" for the insulation system through the application of inert gases for transformers designed for maximum coil temperatures of 3S0°C. , and the application of epoxies to the molded coil encapsulated transformer.