Rickenbacker 360

Citation : Convertible Comb 12 String Models (336/12, 366/12, 456/12).
The Rickenbacker unique string converter, commonly known as a "comb", was introduced on three models in 1966. It changed the guitar from twelve to six strings (or less than twelve strings) via a lever that pulled the desired number of the strings down against the frets (and in theory out of the way). When not engaged, the guitar is a "normal" twelve string. The comb converter was available on the 336/12, 366/12, and 456/12 (solidbody). The 336/12 was a model 330-12 with a comb. Likewise the 366/12 was a model 360-12 with a comb, and the 456/12 was a model 450-12 with a comb. The string coverter was designed by James E. Gross of Glenview, Illinois. The convertible comb models disappeared from the Rickenbacker product line in 1976 (but in reality production of this model stopped in 1974). Probably because this idea was not very good for the player. For example, strings could not be bent when the comb was engaged. So the usefulness of a combed twelve-string-made-six-string was limited at best, and certainly looked strange.