Talking Machine World, October 1919, p. 159: "C. A. Griffis, 911 Kent Building, Toronto, Ont., has been appointed Canadian selling agent for Triangle tone-arms, Magnedo needles, the new Dayton motor and the Supertone needles. They are also the Canadian representatives for the Plaza Music Co.

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The Trader, Publication of Canadian Jeweler, January 1920, p. 55.



Canadian Music Trades Journal, November 1919, p. 90.