Business & Finance: Twelve-Year Quarrel

Five years ago, when the Federal Trade Commission ended its first investigation† of the Radio Corporation of America, it compiled 21 closely printed pages of U. S. radio patents. The commission named no single patent as most important. But many a radio engineer, if questioned, now would pick one patent as outstanding. Without the "feedback circuit," used in transmitting and receiving alike, necessary to transAtlantic telephony, to superheterodyne receiving sets, no commercial radio company could operate.

Over the authorship of this paramount "feedback" invention, two men...