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"If we're going to be consistent and advocate freedom of speech we have to advocate freedom of encrypted speech too. The genie is out of the bottle, cryptologically."
- Neal Stephenson

Helmet-Mounted Display Screen  
  A small electronic display mounted for easy viewing.  

Who had the first idea for a helmet-mounted display screen? Here's a very early candidate.

He twisted his head around and blinked to focus his eyes on the two-inch oscilloscope screen set inside his helmet. The little green face smiled at him - the jagged wave pattern gleaming like a row of broken teeth.
From Rock Diver, by Harry Harrison.
Published by Hillman Periodicals in 1951
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