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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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A landing signal officer uses a sound-powered telephone headset during flight operations aboard the nuclear-powered aircraft carrier USS DWIGHT D. EISENHOWER (CVN 69) - NARA & DVIDS Public Domain Archive Public Domain