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circa 1931, in the meaning defined above
so called from the three accent marks of the symbol C′″ representing the second C above middle C
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three-lined potato beetle
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“Three-line octave.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/three-line%20octave. Accessed 26 Nov. 2021.
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