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I've never seen it, but that doesn't prove it doesn't happen. If it does, though, it's likely to be in older writing, particularly older British writing (or texts translated from European languages), which is the only place you find quavers and their progeny to begin with. Modernly, the system of using numeric fractions both orally and in print has become all but universal. Paul Hindemith, the great musical polymath, was not one to countenance any slipshod practices or relaxation of standards (he was, e.g., quite sharp-tongued about such harmless-looking practices as writing tenor voices in treble clef), and his textbooks, written in the 1940s, are strictly numeric fractions for rhythms.
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