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Notes -
Yeah, this one is so common and so annoying. As you note there are many patents predating Lamarr and Antheil's: for example by Purington (in 1940 and 1935); by Broertjes in 1929; by Chaffee in 1922; by Blackwell, Martin, and Vernam in 1926, and even by Tesla in 1903. Jonathan Zenneck's text Wireless Telegraphy (which appeared in Germany in 1909) also contains a section on frequency hopping, and adds in a footnote that “This method was adapted by the Telefunken Co. at one time,” showing that the core principle was applied as early as the opening of the 20th century. Frequency hopping was most certainly not pioneered by Lamarr.
Additionally, she was at one point married to an Austrian munitions manufacturer whose work she had access to and interest in, and German engineers before World War II were aware of frequency hopping - it is not beyond the realm of possibility that the idea could've been derived from her former husband's colleagues.
Edit: added more
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