and style 165 have duplex roll frames, on which one roll plays while the other rewinds, allowing for continuous music. Each paper roll contained about 10 songs. During the Great Depression this was changed to 6 longer songs to save money on arranging. The only substantial changes between the Wurlitzer U.S.-made organs and the European originals they copied is that the Wurlitzer models operated on Wurlitzer's unique roll scale. These included the 41-note style 125 roll (used by styles 103, 104, 105, 106, 125, and 126), the wider 46-note 150 roll (used by styles 145, 146, 147, 148, 150, and 153), or the still wider 75-note 165 roll (used by styles 157, 163, 164, 165, 166, and 175). Due to Wurlitzer's success and domination of the market, many smaller American manufacturers adopted scales similar to Wurlitzer's. Wurlitzer abandoned production of band organs and nickelodeons in 1939 but continued to manufacture the paper music rolls through a wholly owned subsidiary called the Endless Roll Music Company. In addition to manufacturing band organs, Wurlitzer also converted band organs made by other companies to their roll scales. This generally resulted in the converted organ having an expanded musical library due to the vast amount of available Wurlitzer music rolls. However, these conversions sometimes required modifications to the organ's pipes and could permanently change the sound of the converted organ. The production of Wurlitzer organs ceased in 1939, the last organ to leave the factory being a style 165 organ in a 157 case (done because Wurlitzer had an extra 157 case remaining in the factory and the owner didn't mind the change). During the Great Depression leading up to the end of production, various cost-cutting measures were made, such as the substitution of brass horn and trumpet pipes for ones made of wood (though arguably the change from brass to wood may have been due to the shrill sound produced by the brass pipes which some people may have found unpleasant; wood pipes produced a mellower sound). Some orchestrions made by the company can be found at Clark's Trading Post, Lincoln, New Hampshire, the Music Hall, Nevada City, Montana, and the Jasper Sanfilippo Collection at Victorian Palace, Barrington Hills, Illinois. Nickelodeons and player pianos Wurlitzer, starting around 1900 until circa 1935 produced nickelodeon pianos, or coin pianos, which are electrically operated player pianos that take coins to operate, like a jukebox. The company