How to Make a Telegraph Machine in Home - 搜索视频

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起始时间 01:04Recap of Simple Machines and Inclined Planes

How to build your own simple machine

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起始时间 00:02Introduction to the Telegraph Device

DIY Telegraph Construction

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起始时间 00:10What is a Telegraph?

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起始时间 01:05Building the Block

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起始时间 00:15Introduction to the Telegraph Kit

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