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Harald T. Friis
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.
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