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Re: Infrared sextant
From: Dave Walden
Date: 2014 Aug 24, 11:34 -0700

I also saw this the other day. Here's the patent:

https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US1944897.pdf

and an image:

http://www.gettyimages.com/detail/news-photo/paul-humphrey-macneil-inventor-of-the-macneil-all-weather-news-photo/3336630

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