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The name has a long and involved history that is interwoven with that of the resonator guitar. Originally coined by the Dopyera brothers when they formed the Dobro Manufacturing Company, in time it came to commonly mean a resonator guitar, or specifically one with a single inverted resonator. This particular design was introduced by the Dopyeras' new company, in competition to the already patented Tricone and biscuit designs owned and produced by the National String Instrument Corporation.
When Gibson acquired the trademark in 1994, the company announced that it would defend its right to Dobro's exclusive use.
The name originated in 1928 when the Dopyera brothers formed the Dobro Manufacturing Company. "Dobro" is both a contraction of "Dopyera brothers" and a word meaning "goodness" in their native Slovak (and also in most Slavic languages). An early company motto was "Dobro means good in any language."
The Dobro was the third resonator guitar design by John Dopyera, the inventor of the resonator guitar, but the second to enter production. Unlike his earlier tricone design, the Dobro had a single resonator cone and it was inverted, with its concave surface facing up. The Dobro company described this as a bowl shaped resonator.
The Dobro was louder than the tricone and cheaper to produce. In Dopyera's opinion, the cost of manufacture had priced the resonator guitar beyond the reach of many players. His failure to convince his fellow directors at the National String Instrument Corporation to produce a single-cone version was part of his motivation for leaving.
Since National had applied for a patent on the single cone (US patent #1,808,756), Dopyera had to develop an alternative design. He did this by inverting the cone so that, rather than having the strings rest on the apex of the cone as the National method did, they rested on a cast aluminum spider that had eight legs sitting on the perimeter of the downward-pointing cone (US patent #1,896,484).
In the following years both Dobro and National built a wide variety of metal- and wood-bodied single-cone guitars, while National also continued with the Tricone for a time. Both companies sourced many components from National director Adolph Rickenbacher, and John Dopyera remained a major shareholder in National. By 1934, the Dopyera brothers had gained control of both National and Dobro, and they merged the companies to form the National-Dobro Corporation.
From the outset, wooden bodies had been sourced from existing guitar manufacturers, particularly the plywood student guitar bodies made by the Regal Musical Instrument Company. Dobro had granted Regal a license to manufacture resonator instruments. By 1937, it was the only manufacturer, and the license was officially made exclusive. Regal continued to manufacture and sell resonator instruments under many names, including Regal, Dobro, Old Kraftsman, and Ward. However, they ceased all resonator guitars production following the U.S. entry into the Second World War in 1941.
Emil Dopyera (also known as Ed Dopera) manufactured Dobros from 1959 under the brand name Dopera's Original before selling the company and name to Semie Moseley. Moseley merged it with his Mosrite guitar company and manufactured Dobros for a time. Meanwhile, in 1967, Rudy and Emil Dopyera formed the Original Musical Instrument Company (OMI) to manufacture resonator guitars, which were at first branded Hound Dog. However, in 1970, they again acquired the Dobro name, Mosrite having gone into temporary liquidation.
Along with the Dobro name, OMI was acquired by the Gibson Guitar Corporation in 1993. They renamed the company Original Acoustic Instruments and moved production to Nashville. Gibson now uses the name Dobro only for models with the inverted-cone design used originally by the Dobro Manufacturing Company. Gibson also manufactures biscuit-style single-resonator guitars, but it sells them under names such as Hound Dog and Epiphone. The Dobro was first introduced to country music by Roy Acuff.
Wider usage of the name 
Gibson now restricts the use of the name Dobro to its own product line, but care should be taken in interpreting documents written before 1993 or from outside the US. In these cases, the terms "Dobro" and "dobroist" may not necessarily refer to a Gibson Dobro. For example, consider the references to the use of a Dobro guitar on songs like "The Ballad of Curtis Loew" by Lynyrd Skynyrd, "Valium Waltz" by the Old 97's, "When Papa Played the Dobro" by Johnny Cash on the Ride This Train album, or "Gold Dust Woman", a song by Fleetwood Mac from the album Rumours which features a Dobro. Mark Knopfler of Dire Straits is famous for his guitar of this style, featured on the cover of the album Brothers in Arms.
Modern instruments 
As of 2006[update], many makers, including Gibson, were manufacturing resonator guitars to the original inverted-cone design. Gibson also manufactures biscuit-style resonator guitars, but reserves the Dobro name for its inverted-cone models. These "biscuit" guitars are often used for blues and are played vertically instead of horizontally like a "spider" bridge.
In addition to modern versions of tricones and single cone resonators, National Resophonic also produce Dobro-style guitars. This company made the Model D during the latter part of the 2000s. Production of the Model D guitar has now ceased, but a few dealers in the UK and USA have stock available. National Resophonic are now producing their Smith & Young `Spider Cone' models and the Model 11 is built on traditional Dobro lines. Also, Goldtone, Paul Beard and a number of custom builders are producing good guitars.
As well as recreating the traditional sounds and look, resonator guitars have also become the foundation for even further developments in the world of guitars. Many Dobro-style guitars are now hybrid electric guitars, and some manufacturers are adding strings to create 7- and 8-string resonator-style guitars.
- Registration Number 0950801, registered January 16, 1973
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- Current replicas with sound-sample
- Dobro page at the Gibson Web site.
- Fender resonator guitar home page parallel to the Gibson home page above
- 1997 Dobro solid body electric guitar.
- Harlow Dobro http://www.harlowresonatorguitars.com/Harlow/Home.html
- Chanticleer (UK) - current maker of resophonic instruments
- Some notes on Resonator guitars,