Resonator mandolin
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A resonator mandolin or "resophonic mandolin" is a mandolin whose sound is produced by one or more metal cones instead of the customary wooden soundboard. These instruments are sometimes referred to a
1930 National Triolian resonator mandolin from Lowell Levinger's collection
Blue Comet mandolin. This one was manufactured by the Regal Musical Instrument Company.
Dobro
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Dobro is an American brand of resonator guitars owned by Gibson and manufactured by its subsidiary Epiphone. The term "dobro" is also used as a generic term for any wood-bodied, single-cone resonator
Resonator mandolin
…one or more metal cones (resonators) instead of the customary wooden soundboard (mandolin top/face). These instruments are sometimes referred to as "Dobro mandolins," after pioneering instruments designed and produced by the Dopyera Brothers, which evolved into a brand name. The trademark "Dobro" is…
Dobro–style tenor guitar, 1934
"Spider"-shape resonator detail