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The most significant distinction between ordinary telephones and sound-powered telephones is in the operation of the microphone. Since the microphones used in most telephones are designed to modulate a supplied electric current they cannot be used in sound-powered transducers. Most sound-powered telephones use a dynamic microphone.
Field telephones are telephones used for military communications. They can draw power from their own battery, from a telephone exchange (via a central battery known as CB), or from an external power source. Some need no battery, being sound-powered telephones. Telephone linesmen ford Lunga River during the Guadalcanal Campaign of World War II
Some military surplus dealers also sell military surplus firearms, [2] spare parts, and ammunition alongside surplus uniforms and equipment. Demand for such items comes from various collectors, outdoorsmen, adventurers, hunters, survivalists, and players of airsoft and paintball, as well as others seeking high quality, sturdy, military issue garb.
Earlier this year, I reported that the city’s last military surplus store, G.I. Rose Military Surplus Etc. at 6310 E. Harry, was in danger of closing if the owner couldn’t find a buyer to take ...
Military comms include command, control and communications and intelligence and were known as the C3I model before computers were fully integrated. The U.S. Army expanded the model to C4I when it recognized the vital role played by automated computer equipment to send and receive large, bulky amounts of data.
The talker helmet or phone-talker helmet is a combat helmet used by the United States Navy and United States Coast Guard.It was originally designed in 1942 as a special-purpose naval helmet for deck crews that could fit additional equipment the contemporary M1 helmet was incompatible with, such as a sound-powered telephone headset.