 the dobro is a particular brand of resonator guitar. the dobro was originally made by the dopyera brothers when they formed the dobro manufacturing company. their design, with a single inverted resonator, was introduced in competition to the patented tricone and biscuit designs produced by the national string instrument corporation. the dobro name appeared on other instruments, notably electric lap-steel guitars and solid-body electric guitars and on other resonator instruments such as safari resonator mandolins. gibson guitar corporation acquired the dobro trademarkus trademark registration number 0950801, january 16, 1973 in 1994. although the name dobro is generically associated with the single-inverted-cone design, gibson has announced that it would defend its right to exclusively use the name. ==history== right|thumb|180px|1928 "dobro-style" 37 tenor guitar. right|thumb|180px|resonator guitar with single inverted resonator. thumb|right|200px|spider resonator detail.  the name originated in 1928 when the dopyera brothers, john and emil (ed), formed the dobro manufacturing company. "dobro" is both a contraction of "dopyera brothers" and a word meaning "goodness" or goodwill 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-c
Acoustic_guitars Companies_established_in_1928 Guitar_manufacturing_companies Resophonic_instruments