agitprop.
"Although it appears that during World War II the U.S. Army Signal Corps experimented on a spread-spectrum communication system, the U.S. Navy never used the Lamarr/Antheil system on torpedoes as it considered its clockwork piano roll mechanism for changing frequencies to be too bulky and unreliable. It wasn’t until 1957 that Sylvania was able to revive and the idea, with an electronic controller based on the recently invented transistor. Since then, the Lammar/Antheil patent has been cited numerous times by communications and information processing patents. It’s indeed an important technological concept used in wifi, cellphones, and other communications.
Hedy Lamarr did not, however, invent wifi or cellphones. Wifi as we know it was invented by John O’Sullivan, an Australian engineer while working at the Netherlands’ Dwingeloo Radio Observatory in 1977."