sentences:  Other notable early achievements of Dr. Smith were the purchase in 1951 of the rights to his sine-function generator, by Hewlett Packard,
  and in 1958, the publication of a technical textbook on feed back control systems by McGraw-Hill.More recently Dr. Smith has developed methods of running three-phase induction motors on single-phase power.He has also worked on methods of providing power to single phase supply lines from three phase generators.