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fnordfnordfnord
on June 28, 2013
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New leak shows NSA harvests To, From, and Bcc line...
It's probably an optic with a coating that reflects some percentage (probably a small percentage) of the light, and a second detector.
http://www.edmundoptics.com/optics/beamsplitters/
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http://www.edmundoptics.com/optics/beamsplitters/