The Fairchild-Dornier Do-328JET - 1 views
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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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