Definition of extremely high frequency
: a radio frequency in the highest range of the radio spectrum — see Radio Frequencies Table
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“Extremely high frequency.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extremely%20high%20frequency. Accessed 30 Jun. 2022.
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Time Traveler for extremely high frequency
The first known use of extremely high frequency was in 1952
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