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File:US Navy 031015-N-9214D-014 Signalman 3rd Class Jeff Allen uses a signal light to communicate with other ships in the vicinity during missile firing exercises off the coast of Southern California.jpg - Wikimedia
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US Navy tests signal lamp-based ship-to-ship texting
File:US Navy 090708-N-3925A-001 Quartermaster 1st Class Samir Patel uses a signal light to communicate during an underway replenishment aboard the amphibious transport dock ship USS Cleveland (LPD 7).jpg - Wikimedia Commons
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Office of Naval Research Set to Upgrade the 200-Year-Old Signal Lamp for Modern Stealth Communication
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Original U.S. WWII US Navy Ships Morse Code Signal Lamp Shutter Assemb – International Military Antiques
