Telephone

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.The telephone is a telecommunications device that transmits and receives sound, most commonly the human voice. It is one of the most common household appliances in the developed world, and has long been considered indispensable to business, industry and government. The word "telephone" has been adapted to many languages and is widely recognized around the world. The device operates principally by converting sound waves into electrical signals, and electrical signals into sound waves.

Klappentext

The telephone is a telecommunications device that transmits and receives sound, most commonly the human voice. It is one of the most common household appliances in the developed world, and has long been considered indispensable to business, industry and government. The word "telephone" has been adapted to many languages and is widely recognized around the world. The device operates principally by converting sound waves into electrical signals, and electrical signals into sound waves.