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The Lanson Screen by Leo Zagat:
Science Fiction Inventions, Technology and Ideas
"What Man Can Do Man Can Undo — Yet No Earthly Power Could Penetrate the Invisible Barrier that Isolated a Great City from the World!"

(Lanson Screen from 'The Lanson Screen' by Leo Zagat)
Select
an invention:
Lanson Screen An elliptical shield of force large enough to enclose a city.
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