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Some suggestions are made for further developments in the field of electrolytic capacitors using etched aluminum foils and solid electrolytes. Various laboratory-tested construction procedures are discussed in detail. The behavior of capacity, dissipation factor, and leakage is illustrated as the function of temperature and frequency during storage with and without current. It is shown that the production of aluminum electrolytic capacitors with commercially available etched foils and solid electrolytes will be entirely feasible in the near future. In conclusion, the optimal data found so far in a series of experiments are reported, pointing the way toward results that may reasonably be expected from further investigations.