1. Technological frontier
... . The voice transducer (transmitter and receiver) technology developed by Bell paved the way for electronic recording of sounds, music, and voice. In the 1990's the technological frontier opened doors to digital phones smaller than the human hand. Phones now have been developed (not marketed yet) that one can see the other person that they are talking to. In the long run ... build up of interference in the building. When it does sometimes work, the conversation on the phone is very choppy will cut off the connection in the middle of conversation. Digital services currently are only acces...
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