Here's an article on the AN/PDR-27T
http://www.civildefensemuseum.com/southrad/anpdr27t.html
And here's one on the AN/PDR-27C
http://www.civildefensemuseum.com/southrad/im74cpdr27c.html
http://www.civildefensemuseum.com/southrad/anpdr27t.html
And here's one on the AN/PDR-27C
http://www.civildefensemuseum.com/southrad/im74cpdr27c.html
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