e/Palm pedal

Information
has gloss	eng: A palm pedal a mechanical device that consists of levers attached to the strings of a guitar or other stringed instrument for the purpose of pulling the strings up in pitch to a preset half-step or whole-step. Boomer Castleman is known as the inventor. Bigsby was the manufacturer of this product in the early seventies.
lexicalization	eng: Palm pedal
instance of	c/Guitars