John Weston

grandfather paradox n.	1950 J. Weston Grandfather Paradox in Fantastic Adventures Apr. 136/1 ‘I can't see that anything can ever be done about time—I always think of the “Grandfather Paradox”—remember?’ ‘Yes, I know it by heart…. Time-travel is impossible, because a man could travel back in time, inadvertently kill his grandfather, and thus prevent himself from ever having been born!’
helicab n.	1950 J. Weston Heli-cab Hack in Amazing Stories June 146/2 I'm a hack, and I'm looking for a new helicab—something in fair condition. What have you got?