Hello,
The mentioned techique is in the ELF range.
https://en.wikipedia.org/wiki/Extremely_low_frequency
I have also attached a PDF's about it, that I have found.
Bertus
The mentioned techique is in the ELF range.
https://en.wikipedia.org/wiki/Extremely_low_frequency
I have also attached a PDF's about it, that I have found.
Bertus
Attachments
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