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Apparatus for Providing Ac Electrical Energy at a Preselected Frequency
(U.S. Patent and Trademark Office, 1972-05-16)
A method and apparatus for providing AC electrical energy at a preselected frequency including a driven AC generator having an externally excitable field, means connected to the generator field for exciting the field at ...
Field Modulated Alternator System and Control Therefor
(U.S. Patent and Trademark Office, 1973-04-10)
A polyphase alternator of basic frequency F.sub.2 with a field circuit excited with alternating current of frequency F.sub.1, and including full wave rectifier means across each phase of the alternator, all connected in ...