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A resonator guitar or resophonic guitar (often generically called a "Dobro" [1]) is an acoustic guitar that produces sound by conducting string vibrations through the bridge to one or more spun metal cones , instead of to the guitar's sounding board (top). Resonator guitars were originally designed to be louder than regular acoustic guitars ...
The Dobro was originally a guitar manufacturing company founded by the Dopyera brothers with the name "Dobro Manufacturing Company". Their guitar design, with a single outward-facing resonator cone, was introduced to compete with the patented inward-facing tricone and biscuit designs produced by the National String Instrument Corporation.
The National String Instrument Corporation was an American guitar company first formed to manufacture banjos and then the original resonator guitars. National also produced resonator ukuleles and resonator mandolins. The company merged with Dobro to form the "National Dobro Company", then becoming a brand of Valco until it closed in 1968.
National Reso-Phonic Guitars model range includes not only the tricone and biscuit mechanisms used on the original National instruments, but also the inverted cone design used on the Dobro. National also builds and finishes small parts for other North American guitar and ukulele makers.
Resonator ukuleles generally utilize a "National style" single-resonator biscuit cone, although a small number (including those made by the Dobro company in the 1930s) use a bowl resonator and spider cone. Tricone resonators, such as seen in many National resonator guitars and mandolins, are not generally used.
The Dobro or resonator guitar is a uniquely American lap steel guitar with a resonator cone designed to make a guitar louder. [ 15 ] : 109 It was patented by the Dopyera brothers in 1927, [ 15 ] : 109 but the name "Dobro", a portmanteau of DOpyera and BROthers, became a generic term for this type of guitar. [ 44 ]
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