phonoscope

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pho·no·scope

(fō'nō-skōp),
Obsolete term for an instrument for recording ausculatory percussion; originally used for photographic recording of heart sounds.
[phono- + G. skopeō, to view]

phonoscope

(fō′nō-skōp) [″ + skopein, to examine]
A device for recording heart sounds.