Question: When was the first electric version of Trefor Goronwy's instrument made?

full_context: Document 1: Darren Korb: Korb attended Bellarmine College Preparatory high school in San Jose, California. There he would meet his longtime friend and collaborator Logan Cunningham. Having an engineering background, Korb went to New York University for music production and music business. Prior to his work with Supergiant Games, he worked on minor television and film projects. He was also a member of the NYC band Audio Fiction and was the co-founder, as well as a current member of NYC indie band, Control Group.
Document 2: Höfner 500/1: The Höfner 500/1 violin bass (nicknamed the "Beatle bass" or "Cavern bass") is a hollow-bodied bass guitar manufactured by Höfner under several varieties. It was introduced in the mid-1950s and gained celebrity status during the 1960s as one of the primary basses used by Paul McCartney of The Beatles.
Document 3: Roger Waters discography: Roger Waterss primary instrument is the electric bass guitar. He briefly played a Höfner bass but replaced it with a Rickenbacker RM-1999/4001S, until around 1970 when he switched to Fender Precision basses. He often plays bass using a pick but is also known to play fingerstyle. Not only a bassist and vocalist, Waters has experimented with the EMS Synthi A and VCS 3 synthesisers and has played electric rhythm and acoustic guitars in recordings and in concert. Throughout his career he has used Selmer, WEM, Hiwatt and Ashdown amplifiers, also employing delay, tremolo, chorus, panning and phaser effects in his music.
Document 4: Bass guitar: In the 1930s, musician and inventor Paul Tutmarc from Seattle, Washington, who was manufacturing lap steel guitars, developed the first electric string bass in its modern form, a fretted instrument designed to be played horizontally. The 1935 sales catalog for Tutmarc's electronic musical instrument company, Audiovox, featured his ``Model 736 Bass Fiddle '', a four - stringed, solid - bodied, fretted electric bass instrument with a 30 ⁄ - inch (775 - millimetre) scale length. The adoption of a guitar's body shape made the instrument easier to hold and transport than any of the existing stringed bass instruments. The addition of frets enabled bassists to play in tune more easily than on fretless acoustic or electric upright basses. Around 100 of these instruments were made during this period.
Document 5: The Gurdjieff Ensemble: "The Gurdjieff Folk Instruments Ensemble" based in Armenia was founded in 2008, and is led by the Armenian musician, Levon Eskenian. The Ensemble’s awards include the prestigious Dutch Edison Award: Best World Music Album 2012 and Armenian National Music Award: Best Folk Music Album 2011, for their album, “Music of Georges I. Gurdjieff,’’ produced by ECM Records. The ensemble consists of Armenia’s leading practitioners of traditional music performing on Duduk, Blul, Kamancha, Oud, Kanōn, Santur, Tar/Saz, Dap/Daf, Dhol, and Tombak. The repertoire is composed of the “mystic and spiritual teacher,” George I. Gurdjieff's Armenian, Greek, Assyrian, Arabic, Kurdish, Caucasian spiritual and folk music, authentically arranged for Eastern instruments by Eskenian. The repertoire also includes additional Eastern music that exemplifies Gurdjieff’s musical influences during his travels in the East.
Document 6: Bee Gees: When it, too, failed to attract much interest, Mardin encouraged them to work within the soul music style. The brothers attempted to assemble a live stage band that could replicate their studio sound. Lead guitarist Alan Kendall had come on board in 1971 but did not have much to do until Mr. Natural. For that album, they added drummer Dennis Bryon, and they later added ex-Strawbs keyboard player Blue Weaver, completing the Bee Gees band that lasted through the late '70s. Maurice, who had previously performed on piano, guitar, harpsichord, electric piano, organ, mellotron and bass guitar, as well as mandolin and Moog synthesiser, by then confined himself to bass onstage.
Document 7: Ned Steinberger: Ned Steinberger (b. Princeton, New Jersey, 1948) is an American creator of innovative musical instruments. He is most notable for his design of guitars and basses without a traditional headstock, which are called Steinberger instruments. He also has a line of electric basses and string instruments through his company called NS Design and was also the designer of the first ever Spector bass, the NS. In addition, Ned and Emmett Chapman, creator of the Chapman Stick, collaborated on the creation of the NS Stick, a guitar/bass "multi-mode" instrument sold by Stick Enterprises.
Document 8: Trefor Goronwy: Trefor Goronwy is a vocalist, bass guitarist, guitarist, and percussionist. He joined This Heat for their final European tour in 1982, and continued to work with drummer Charles Hayward and soundman Stephen Rickard in the group Camberwell Now. He has also worked as a sound technician with groups such as Pere Ubu, Towering Inferno, David Thomas and Two Pale Boys, Spearmint, Momus and the Tuvan throat-singing ensemble Huun-Huur-Tu, whose first album he recorded in London. After several years spent in Russia, he has recently been working on recordings featuring Tuvan and Kazakh traditional instruments, particularly the igil and kobyz.
Document 9: Mandolin: Another family of bowlback mandolins came from Milan and Lombardy. These mandolins are closer to the mandolino or mandore than other modern mandolins. They are shorter and wider than the standard Neapolitan mandolin, with a shallow back. The instruments have 6 strings, 3 wire treble-strings and 3 gut or wire-wrapped-silk bass-strings. The strings ran between the tuning pegs and a bridge that was glued to the soundboard, as a guitar's. The Lombardic mandolins were tuned g b e' a' d" g". A developer of the Milanese stye was Antonio Monzino (Milan) and his family who made them for 6 generations.
Document 10: Living Colour: Vernon Reid -- lead guitar, guitar synthesizer, programming, laptop, backing vocals (1984 -- 1995, 2000 -- present); lead vocals (1984 -- 1985) Corey Glover -- lead vocals, occasional rhythm guitar, occasional tambourine (1985 -- 1995, 2000 -- present) Will Calhoun -- drums, percussion, keyboards, samples, loops, programming, backing vocals (1986 -- 1995, 2000 -- present) Doug Wimbish -- bass, drums, guitar, programming, backing vocals (1992 -- 1995, 2000 -- present)
Document 11: Music Man Bongo: The Bongo is a model of bass guitar manufactured by Music Man, a division of Ernie Ball. It was first introduced at the NAMM Show on March 21, 2003. Ernie Ball president Sterling Ball designed the instrument in conjunction with the Music Man Research and Development department and BMW's Designworks team. It is equipped with an 18-volt 4-band preamp (except on the single-pickup model, which has a 3-band preamp; single-pickup models with piezo bridges have a 4-band preamp) designed by Dudley Gimpel with help from Cliff Hugo and other Music Man artists. It also sports a sleek, carved basswood body with high-gloss polyester finish and a satin-finish painted 34" scale maple neck with rosewood fingerboard (pau ferro on lined or unlined fretless, ebony on both fretted and fretless "stealth" basses) featuring 24 high-profile wide frets and crescent moon-shaped position inlays. These basses are generally known for their dual humbucking pickup configuration, as they are the first twin humbucker-equipped models released by Music Man since the introduction of their Sabre and Cutlass bass guitars in the late 1970s.
Document 12: The Ramong Sound: The Ramong Sound was a London based outfit, that featured two black lead singers doing Sam & Dave styled duets, one of them being former professional boxer Clem Curtis, and the other being Raymond Morrison aka Ramong Morrison. Curtis joined the group after hearing from his uncle that the lead singer of the group Ramong, was looking for backing singers and he should give it a try. At this time was Curtis's singing experience was more or less limited to singing with his uncle when he came around the house with the guitar. Prior to joining the Ramong Sound, 25 yo Curtis was a professional boxer and had worked as a painter and interior decorator. Guitar player Alan Warner was an experienced musician, and joined the Ramong Sound after having worked in various bands. He would stay with the group through all of their name change evolutions from Ramongs to Foundations, until he left the Foundations in 1970 to join progressive rock band Pluto. At some stage the group had dropped the "sound" part of their name and shortened it to simply The Ramongs, or The Ramong.
Document 13: Solid body: The origins of the solid body electric guitar are confusing. The first commercially available solid body electric Spanish guitar was produced by the Rickenbacker company in 1931. Les Paul, a guitarist, is often erroneously credited with inventing the first solid body, but Fender is often incorrectly credited as the first to commercially market a solid body electric guitar, which itself was based on a design by Merle Travis. Also it is reported that around the same time (1940) a solid body was created by Jamaican musician and inventor, Hedley Jones. In the 1940s, Les Paul created a guitar called the ``Log, ''which came`` from the 4'' by 4 ''solid block of pine which the guitarist had inserted between the sawed halves of the body that he'd just dismembered. He then carefully re-joined the neck to the pine log, using some metal brackets.'' He then put some pickups that he designed on it. He soon went to companies asking if they would buy his guitar. They turned him down. However, after the Fender Telecaster electric guitar became popular, the Gibson company contacted him and had him endorse a model named after him, The Les Paul guitar. It came out in 1952.
Document 14: Eritrea: Eritrea's ethnic groups each have their own styles of music and accompanying dances. Amongst the Tigrinya, the best known traditional musical genre is the guaila. Traditional instruments of Eritrean folk music include the stringed krar, kebero, begena, masenqo and the wata (a distant/rudimentary cousin of the violin). The most popular Eritrean artist is the Tigrinya singer Helen Meles, who is noted for her powerful voice and wide singing range. Other prominent local musicians include the Kunama singer Dehab Faytinga, Ruth Abraha, Bereket Mengisteab, Yemane Baria, and the late Abraham Afewerki.
Document 15: Mandolin: The instrument was primarily used in an ensemble setting well into the 1930s, and although the fad died out at the beginning of the 1930s, the instruments that were developed for the orchestra found a new home in bluegrass. The famous Lloyd Loar Master Model from Gibson (1923) was designed to boost the flagging interest in mandolin ensembles, with little success. However, The "Loar" became the defining instrument of bluegrass music when Bill Monroe purchased F-5 S/N 73987 in a Florida barbershop in 1943 and popularized it as his main instrument.
ground_truth: the 1930s
sub_queries: Trefor Goronwy >> instrument Answer: bass guitar
when was the first electric bass guitar made Answer: the 1930s