to a violin, as well as multiple radial slots along the outer edge. Another design innovation was the "Tone Amplifier". The device consists of a metal flat bar between the piano rim, running under the bass bridge to a fixed point on the soundboard, designed to bring out the tone on a smaller piano. A screw mechanism on top of the bridge allowed adjustment of the tonal output. Wurlitzer made at least three different versions of the 73 key model butterfly. Each had variations in appointments, such as legs, lyres, and sheet music stands. Band organs After the United States Government imposed high import tariffs on street and fairground organ importation in 1892, Wurlitzer began producing mechanical organs. Most were small barrel organs, playing from a pinned barrel and powered by either steam or cranked by hand. Many of these organs have cases finished in dark (and sometimes black) wood, with gold incised designs, not unlike those of the European manufacturers of barrel organs. As parts were not subject to import tariffs, almost all Wurlitzer band organs are copied from designs by European manufacturers. For example, the style 104 and style 105 were copied from a Gebrüder Bruder barrel organ. The style 146 was identical copied from Brüder's model 79 fairground organ, except that the side wings (portions of the façade concealing the drums) were removed. The style 157 was copied from a Gavioli special style of organ (only 2 or 3 of this style of organ are known to exist; the former organ at Dorney Park & Wildwater Kingdom was one, but it was destroyed in a fire). And, the style 165 is copied from the Gebrüder Bruder "Elite Apollo Orchester." As demand for organs grew from the fairground operators, Wurlitzer was approached by Eugene de Kleist, an-ex employee of Limonaire Frères and the founder of the North Tonawanda Barrel Organ Factory. After de Kleist developed the tonophone for the company, which won a gold medal at the 1901 Pan-American Exposition, Wurlitzer invested in his company. Wurlitzer bought de Kleist's interest in the business in 1909 and assumed operation of the North Tonawanda factory. The new company invested in new technology, resulting in the adoption of electric motors, and the music source was changed from pinned barrels to perforated paper rolls similar to a player piano roll. Some medium to larger organs such as the style 153, style 157