Talking Machine World, October, 1917, p. 48. "The Pratte Piano Co., St. Lawrence Boulevard, Montreal, it is stated, contemplates the manufacture of talking machines on a large scale."
Canadian Music Trades Journal, February, 1918, p. 59. "The Pratte Piano Co., manufacturers of the Pratte piano, have registered their phonograph manufacturing department under the name of the Prattephone Co."
Talking Machine World, July, 1919, p. 143. "Prattephone, Ltd., St. Jerome, Que., has been incorporated to buy, sell and manufacture talking machines with a capitalization of $49,000."
The Canadian Encyclopedia. "The Pratte Piano Company began manufacturing phonographs in 1918 under the name of the Prattephone Co. In 1926 the company merged with the firm of J.-Donat Langelier Ltée, which in 1963 merged with N.G. Valiquette to become Langelier-Valiquette Ltée."
La revue moderne
, Volume 1 Numéro 3, January 15, 1920, 4th page after cover.