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The earliest electric amplifier
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Duration：31 minutes and 0 seconds
Date：2015/07/28

Uploader：chenyy

Introduction

keywords： communication technology

This series of historical stories tells the development process of communications from ancient times to modern times, and provides a detailed introduction to the basic principles, efficiency, and historical background of each communication technology in the process. It is interspersed with many legendary, wonderful and humorous historical stories. Educational and entertaining.

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