CBL Maxitone was a brand name of the Australian Cooke Brothers Proprietary Limited Company. CBL sold musical instruments and accessories including Black Diamond and Bell strings, piano repair materials and were also wholesale distributors. CBL were also distributors of radio and electrical equipment and components. The brand name CBL Maxitone was trademarked in 1938. Newspaper advertising records suggest that CBL were still active into the 1960s and into the modern day as a electrical/radio distributor. Maxitone was also a house brand of Bruno & Sons from at least the 1920s onwards.

Source: CBL Maxitone trademark document

Source: The Sydney Morning Herald. Saturday 19th November 1938

Source: Australian Telecommunications at War - Special Issue. Radio & Electrical Retailer. Volume 23 (no. 16). 2nd May 1946.