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"We follow the scientists around and look over their shoulders."
- Larry Niven

Invisible Cloak  
  A cloak that renders the wearer invisible.  

Long before Harry Potter, Ray Cummings had an electronic cloak that rendered its user invisible. It's very handy for sneaking down those narrow spaceship corridors.

The invisible cloak. We laid it on my grid, and I adjusted its mechanism. I donned it and drew its hood, and threw on its current.

"All right, Anita?"

"Yes"

"Can you see me?"

"No." She had stepped back a foot or two. "Not from here. But you must let no one approach too close."

Then she came forward, put out her hand, fumbled until she found me.

From Brigands of the Moon, by Ray Cummings.
Published by Astounding Stories of Super Science in 1930
Additional resources -

Later, he writes:

Anita turned to seal my door; within my faintly humming cloak I stood besider her. Was I invisible in this light? My invisibility was gone!

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Additional resources:
  More Ideas and Technology from Brigands of the Moon
  More Ideas and Technology by Ray Cummings
  Tech news articles related to Brigands of the Moon
  Tech news articles related to works by Ray Cummings

Invisible Cloak-related news articles:
  - Invisibility Possible With Superlenses
  - Invisibility Cloaks Seen As Possible With Metamaterials
  - Invisibility Cloak Works In Visible Spectrum
  - Invisible Tank Makes The Rounds (I Think)
  - Broadband Invisibility Cloak - Now You See It
  - Invisibility Cloaks Get Bigger
  - Full-Size Invisibility Cloak Now Possible
  - Army Wants Invisibility Cloaks

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SCiO Scanner Wants You To Be Spock
Harvesting Energy From Internal Resonance
Sticker Harvests Energy From Your Skin
Army Wants Invisibility Cloaks

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