Fono Fun - Playmate
Toys, Inc., Great Neck, NY, Playthings Catalogue September
Operollo – Operollo Phonograph Co.,
54 W. Lafayette Blvd., Detroit, Mich. July 3, 1919 Hardware
Age Catalogue* - Not counted in the total number of '-ola'
brands as etymology is one degree of separation.
Metaphone – Article from The
Phonoscope, November 1896
Metaphone – Renamed to "Echophone"
The Phonoscope, December 1896