File:U.S. Navy Operations Specialist 3rd Class Gage Crabtree communicates through a sound-powered telephone while standing watch on the bridge of the amphibious command ship USS Blue Ridge (LCC 19) as the ship
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NEW DAVID CLARK 12511G-01 SOUND POWERED HEADSET W/ ACOUSTIC BOOM H5030 *READ* | eBay
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A Sailor uses a sound-powered phone during a drill. | Flickr
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U.S. Navy Seaman Troy Temple uses a sound-powered phone aboard the aircraft carrier USS Carl
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The Reliability of Sound-Powered Phone Systems | Naval History Magazine - February 2021 Volume 35, Number 1