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kbojezhang44

What are the power tools? The total value of the power tool industry reached 49.989 bil... - 0 views

In 1895, German Overtone produced the world's first DC electric drill. The shell is made of cast iron and can drill 4mm holes in the steel plate. Then a three-phase power frequency (50Hz) electric ...

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started by kbojezhang44 on 16 Mar 21 no follow-up yet
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