Jim Pennino wrote:
"The invention of spread spectrum is generally credited to George
Antheil and Hedy Lamarr (yes the actress) and their patent of 1942."

Yes, I believe Lamarr and her husband encoded several tones in sequence
using a player-piano roll. The system was used in WW-2. Poor old Tesla
only invented the a.c. power system, wireless power transmission, and
demonstrated his remote control of a boat using spread spectrum to avoid
interference more than 40 years before Hedy Lamarr`s patent. T.A. Edison
did his best to deny Tesla credit for anything. That`s commerce.

Best regards, Richard Harrison, KB5WZI