From the initial military communications equipment to now all the streets are used in listening to the artifact, the definition of headphones has long been earth-shaking changes during a hundred years. From the stupid and heavy hand-held headphones, to today's free wireless headset,what changes have headphones experienced ? Today, we come to talk about the life of the past lives. 1)The earliest headphones, have no matter with listening to songs simply. At the end of the 19th century, telecom operators invented the world's earliest headphones, but not for you to listen to songs, mostly for communications, military fields. 2)Headphone was originally used to listen to opera. With the development of cable technology, people no longer were satisfied to go to the opera house to listensing to songs, so someone invented the headphones that can monitor the opera sound, with this stuff, you can listen to opera at home! 3)Dynamic Telephone - the true sense of the or...
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