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Zymole Troteys strengthen the voice, preventing the irritation which follows a long strain, on the vocal cords. They are invaluable to public speakers and singers.
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https://paperspast.natlib.govt.nz/newspapers/TO19121005.2.8
Bibliographic details
Observer, Volume XXXIII, Issue 4, 5 October 1912, Page 6
Word Count
25Untitled Observer, Volume XXXIII, Issue 4, 5 October 1912, Page 6
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