Gibson quote I found

[Ray Peck <rpeck@PureAtria.COM>]

Apropos Echoplex. . .

from Electric Guitars and Basses by Gruhn and Carter:
"Gruhn aqnd Carter go on to describe the early experimental efforts
in electrical instrument design in the 1920s.  Gibson had an early
prototype as early as 1924 but found it very difficult to sell its
own corporate executives on the idea." from BAM 7/12/96