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"My feeling is that the chance of our surviving into the twenty-first century as working civilization is less than fifty percent but greater than zero."
- Isaac Asimov

Etherphone Receiver  
  A special earpiece to hear coded updates.  

Concealed in his right ear was a tiny etherphone receiver, part of the equipment of every member of the Terrestrial Guard Police, to which he belonged as a requirement of his position as Chief of Watch in the greatest other-world hostelry in the Americas.

He listened now, to low, ticking messages, presented in intricate code, as he walked on through the quiet Martian section of the hotel.

Space Liner Ardis coming in from Planet Five of Antares. Landing at 10:19 p.m. in fourth cradle of Civic Space Docks. 4-2-5 on board! 4-2-5 on board! Caution! Caution!"

Technovelgy from Hotel Cosmos, by Raymond Z. Gallun.
Published by Astounding Science Fiction in 1938
Additional resources -

You've got to watch out for 4-2-5's:

4-2-5 the code number assigned by the Space Travel Bureau to a visiting entity who must otherwise remain forever nameless on Earth. Dave had been warned before of 4-2-Ss possible sinister purposes.

Planet Five of Antares was a hellish, hot, reeking place with an atmosphere so lethal that one breath of it would swiftly have killed a man. But 4-2-5 s kind were not men. Their flesh was of a porous, silicous composition, breath- ing and living in a different way than any flesh native to Earth. Hideous, hard-shelled things, 4-2-5s kind crept through the shadowy jungles of their world,

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Additional resources:
  More Ideas and Technology from Hotel Cosmos
  More Ideas and Technology by Raymond Z. Gallun
  Tech news articles related to Hotel Cosmos
  Tech news articles related to works by Raymond Z. Gallun

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