http://database.ukulelecorner.co.uk/site/ukulelemakers/b/bruno Gives the following details:
Some notes on the Maxitone brand name.
This started out in 1924 as a name used for heavy gauge aluminum Banjo resonators to be fitted as aftermarket add-ons for any open back banjo (they came in 3 sizes for 10, 11 and 12 in drums). This was made by the Musical Instrument Specialties Co., of Elkhart Indiana. They must have been popular as fairly soon after Lyon & Healy started using them as metal resonators for their instruments and Bruno came to market with a new model of Tenor Banjo, the Magic Wonder, specially for them. By 1926 the Maxitone name had become so popular that Bruno decided to use it on a number of ranges of instrument including wooden Ukuleles and the two kinds of multi-coloured Banjolele. Here is a quote from a 1926 article announcing the launch
C. Bruno & Son, Inc., wholesalers of musical merchandise, 353 Fourth avenue, New York, are calling attention to their new Maxitone line of banjo-ukuleles made up in the popular new color finishes. The Maxitone line has the closed back and wood rim with sound holes in the rim and the line offers a selection of eight colors. They are orange, pink, lavender, blue, black, red, green and white. The same line of instruments is also made up with an extension wood resonator back, finished in the same colors.
Bruno also announces the Maxitone line of all-metal banjo-ukuleles, with and without extension metal resonators. These instruments are also colored and are made up in nickel, copper and color finishes.