"comma intonation" cite, anyone?

[Laurence Horn]

Does anyone know what the first occurrence of "comma intonation", the
intonation contour assigned to parentheticals and non-restrictive
relative clauses like this one, was?  The OED doesn't have an entry
for "comma intonation", although it's used a lot in linguistics, so I
can't check (much less try to antedate) their records.

LH

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