"Friis, Harald T."@en . . "1976-06-28Z"^^ . "American electrical engineer" . . "1976Z"^^ . "1893Z"^^ . "Harald Trap Friis (February 22, 1893 - June 15, 1976), who published as H. T. Friis, was a noted Danish-American radio engineer whose work at Bell Laboratories included pioneering contributions to radio propagation, radio astronomy, and radar. His two Friis formulas remain widely used."@en . . . . . . . . "Harald Trap Friis"@en . . . . "1893-02-22Z"^^ . "1976-06-15Z"^^ . .