Guitar, Resonator or dobro

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The Resonator Guitar or Dobro Guitar is an acoustic guitar with aluminum plates fitted inside the body to boost the sound. It is loud enough to be heard in live performances without an amplifier. Dobros, and other resonator guitars such as Nationals, first appeared in the 1920s, and were used in dance bands and to play the blues.

Pitch range
About three octaves.
Wooden, plastic, or metal body, with aluminium resonating cones.
About 3 ft 4 in-3 ft 6 in (1.02-1.07 m) long.
The resonator guitar developed in 1920s and 1930s, in California and the Midwest in the USA.
Chordophone: an instrument that produces its sound by the vibration of strings.
And also...
This instrument was given an internal resonator in order to increase its volume. Apart from being popular with dance bands, the resonator guitar was also used by jazz and IJues musicians in the 1930s.

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