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Amazon.com: Heil Sound PR77D Deco Series Dynamic Cardioid Microphone with PR40 Element, Black Body : Electronics
File:KY-57 VINSON manpack with PR-77 radio - National Cryptologic Museum - DSC08031.JPG - Wikimedia Commons
West Auctions - Auction: Complete Sellout of Bay Area Radio Station ITEM: ReVox PR99 MK3 2 Channel Reel to Reel Tape Recorder
![Amazon.com: Heil Sound PR77D Deco Series Dynamic Cardioid Microphone with PR40 Element, Black Body : Electronics Amazon.com: Heil Sound PR77D Deco Series Dynamic Cardioid Microphone with PR40 Element, Black Body : Electronics](https://m.media-amazon.com/images/I/41mhSImJY9L._AC_SY580_.jpg)