Frekuensi amat rendah: Perbedaan antara revisi
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Rescuing 2 sources and tagging 0 as dead.) #IABot (v2.0.9.5 |
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== Paten ==
* Tanner, R. L., ''[http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=3215937 U.S. Patent 3215937] {{Webarchive|url=https://web.archive.org/web/20220921175938/https://patft.uspto.gov/netacgi/nph-Parser?patentnumber=3215937 |date=2022-09-21 }}'' ''"Extremely low-frequency antenna"''. 1965.
* Hansell, Clarence W., ''[http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=2389432 U.S. Patent 2389432] {{Webarchive|url=https://web.archive.org/web/20210129071731/http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=2389432 |date=2021-01-29 }}'', ''"Communication system by pulses through the Earth"''.
== Lihat pula ==
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