Potential answers for "Tuning-fork standard"

⭐⭐⭐⭐ PITCH
⭐⭐⭐ PRONGS
⭐⭐⭐ PETESEEGER
⭐⭐⭐ TONE
⭐⭐⭐ PITCHPIPE
⭐⭐⭐ SINEWAVES
⭐⭐⭐ OBOE
⭐⭐⭐ TINE

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