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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Bibliographic details
New Zealand Herald, Volume XLVI, Issue 14144, 20 August 1909, Page 5
Word Count
25Page 5 Advertisements Column 2 New Zealand Herald, Volume XLVI, Issue 14144, 20 August 1909, Page 5
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