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"We're about 20 minutes away from the point where Clarke's law kicks in and technology becomes indistinguishable from magic."
- Peter Watts

Magnetic Shoes  
  Footgear magnetized for working on steel hulls.  

An early reference to this idea

Two men crawled about the gleaming hull, equipped with magnetic shoes. Both wore antiseptic helmets, as they, worked slowly forward from stern to bow. The forernost carried a heat-ray gun, with the beam diffused and spread wide. Every time he came to one of the many ugly .yellowish blotches that dotted the hull, he rayed it out of existence, then moved on.
From The Dual World, by Arthur K. Barnes.
Published by Thrilling Wonder Stories in 1938
Additional resources -

Compare to magnetic-soled shoes from Space Tug (1953) by Murray Leinster, magnetic sandals from The Warriors (1966) by Larry Niven, magneslippers from Accidental Flight (1952) by WF Wallace and magnetized boots from Lost Rocket (1941) by Manly Wade Wellman.

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Additional resources:
  More Ideas and Technology from The Dual World
  More Ideas and Technology by Arthur K. Barnes
  Tech news articles related to The Dual World
  Tech news articles related to works by Arthur K. Barnes

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