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Plug in USB charger from powerbank input mobile phone or smartphone and laptop computer on wooden floor, Top view.
Steel metal hawser set isolated
Optical time domain reflectometer It is a tool to test the optical signal in fiber optic cables to find the fault of the signal cable and the signal strength measurement tool is called PON meter.
Lightning cable placed on a white background
Set colorful telecommunication network cables, wires isolated on white background, with clipping path

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