This Post points to the Article Titled Extremely Low Frequency (ELF) : https://en.wikipedia.org/wiki/Extremely_low_frequency https://en.wikipedia.org/wiki/Extre

This Post points to the Article Titled Extremely Low Frequency (ELF) : https://en.wikipedia.org/wiki/Extremely_low_frequency https://en.wikipedia.org/wiki/Extremely_low_frequency And Not to; Low Frequency (LF) : https://en.wikipedia.org/wiki/Low_frequency https://en.wikipedia.org/wiki/Low_frequency