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In addition to the Richter System harmonicas, many other types were developed, probably the most important one being the slide chromatic harmonica. This was brought out by Hohner around 1910, although there are patents for similar instruments dating back to the late 1800s and early 1900s. Essentially these are two diatonic harmonicas in one casing, one tuned a semi-tone above the other with a button operated slider to swap between them. Hohner's patent for their Chromonica was granted in 1928 (US pat# 1671309 to David Newman, an employee of Hohner USA), although the instrument had been on the market for a few years by then. The ten holed Chromonica 260 was pictured in the January 1910 issue of Music Trade Review and described as the "latest style" from Hohner and it is featured in Hohner's 1911 catalog, although I have no idea why it took almost twenty years for the design to be patented.