The moment credited to one person and owed to many.
The Fender Esquire is the first commercially marketed solid-body electric guitar. It was designed as an electronic instrument with no acoustic tone manipulation. It introduced the square-edged dreadnought shape with cutaway. It featured a combined bridge-pickup assembly derived from the Champion lap steel. The first 1950 production run had a one-piece maple neck without fretboard or truss rod. The single-pickup version debuted in the RTEC Spring 1950 catalogue.
There is no instrument called 'Eventide, Inc.' from 1971. Eventide, Inc. is a company. Its earliest instruments were the 1745 Digital Delay Line (1971), the PS 101 Instant Phaser (1971), the Omnipressor (1974), and the H910 Harmonizer (1975). Only the PS 101 is confirmed as rack-mount. No instrument described has polyphony, synthesis architecture, or format beyond rack-mount. Claims about sound, feel, or musical use are absent from the source material.
The Fender Mustang is a solid body electric guitar introduced in 1964 as the basis of a major redesign of Fender's student models. It was produced until 1982 and reissued in 1990. It features two single-coil pickups, an unusual pickup switching configuration, and a unique vibrato system. It was originally available in two short scale lengths: 24 inches and 22.5 inches. It has two angled single-coil pickups, each with an adjacent on-off-on switch, and a master tone and volume control. It introduced the Fender Dynamic Vibrato tailpiece, which together with a floating bridge forms the Mustang vibrato system.
The Fender Starcaster is a semi-hollowbody electric guitar introduced in 1975. It features a bolt-on neck with a three-bolt joint, an offset body, maple fretboard, and a master volume control — distinguishing it from typical semi-hollow designs.