Telephone security device circuit schematic

A telephone is a device that transmits voice in both directions through an electrical signal. Alexander Graham Bell is often considered the inventor of the phone. The United States Congress resolution 269 of June 15, 2002 confirmed Antonio Meucci as the inventor of the telephone. The word "telephone" is a Chinese word made in Japanese life. It is used to translate English words and is then sent to China.

Telephone security device circuit schematic



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