Assertion: reed's pitch | /r/HasProperty | an octave flute
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Source sentences:
text: There are three stops: a stopped diapason at 4-foot pitch, mellow and pure-toned; an octave flute at 2-foot pitch, particularly successful in the upper register, and adding a brilliance to the tone; and an 8-foot regal, a beating reed –the oldest stop of its kind known in England.