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 ...
Installing exterior vinyl shutters is usually a simple, straightforward task when installing on wood or siding. Howev...
1. Pushing method Push the bearing with a press, the work is stable and reliable, and the machine and bearing shielding machine room will not be damaged. The press has manual push, mechanical or hy...
Although there are some difficulties in this winter in 2020, it is gratifying that the upgrade and transformation of the entire LED display industry has not slowed down. On the contrary, with the i...
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