The Canadian Patent Office Record and Register of Copyrights and Trade Marks, Vol. XLIV, Ottawa, July 31st, 1916: "The Sonophone Company of Canada, Limited, Montreal, Que. Talking Machines and Talking Machine Records. Word: "Sonophone" enclosed in an ornamental border. 21st September, 1916."

Sherbrooke Daily Record, August 17, 1918, p. 8.

The following pictures are of a Son-o-phone machine for sale in Barrie in December, 2009 (photos by KW):

It was using a Victor Exhibition soundbox.

KW visited the Uxbridge Historical Centre in October, 2013 and was given permission to take and post the following pictures of their Son-o-phone:

A Sonophone for sale on Facebook Marketplace in 2023.