Harmonica
Cover plates

Cover plates cover the reed plates and are usually made of metal, though wood and plastic have also been used. The choice of these is personal; because they project sound, they determine the tonal quality of the harmonica. Two types of cover plates are used: traditional open designs of stamped metal or plastic, which are simply there to be held; and enclosed designs (such as the Hohner Meisterklasse and Super 64, Suzuki Promaster and SCX), which offer a louder tonal quality. From these two basic types, a few modern designs have been created, such as the Hohner CBH-2016 chromatic and the Suzuki Overdrive diatonic, which have complex covers that allow for specific functions not usually available in the traditional design. In the late 19th and early 20th centuries, harmonicas not uncommonly had special features on the covers, such as bells, which could be rung by pushing a button.
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