According to Wikipedia it is "the name persisting in dialect, though some even argue that urban literary figures and musicians, as early as the late 19th century, began using the term
to refer to instruments like the Irish bagpipes, which have two bellows: the bag and the mechanical bellows"; NB¹: According to modern linguists, such as Eva Arim of ILTEC (➺ Web), the expression "gaita de foles" is currently considered, unanimously, the most correct in Portuguese, with the word "gaita de fole" now persisting in the language only as a dialectism;
NB² (Gaita de fole): ➺ Zamora (Spain).

Fole mecânico