A man, apparently dazed from running into a temporal snag, appears in a radio factory, whereupon (before returning to his own time) he makes a radio that’s actually a Twonky which gets shipped to a Mr. Kerry Westerfield, who is initially quite confounded and amazed at all it can do.

Because of the opening, I’m convinced that this Twonky is from the future. The “temporal snag” that brought him there feels like an unexpected time rift to me, although the route back to the future is an intentional journey via an unexplained method.
Michael Main
“Great Snell!” he gasped. “So that was it! I ran into a temporal snag!”

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  1. “The Barrier” by Anthony Boucher, Astounding Science-Fiction, September 1942.
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Anthony Boucher