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Zymole Trokeys 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/TO19100611.2.10.1
Bibliographic details
Observer, Volume XXX, Issue 39, 11 June 1910, Page 6
Word Count
25Page 6 Advertisements Column 1 Observer, Volume XXX, Issue 39, 11 June 1910, Page 6
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