Re: Master copy
Curiously, the earliest citation OED has for 10c ("A plate, stencil, or negative used in any of various reprographic processes to produce copies of a document, etc.") is from 1930, raising the possibility that the term entered the printing industry from the music industry (10a: "An original disc or (formerly) a cylinder with grooves cut by a stylus during sound recording"; first citation 1904).
Biting the hand that feeds IT
