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Printed circuit board — Part of a 1983 Sinclair ZX Spectrum computer board; a populated PCB, showing the conductive traces, vias (the through hole paths to the other surface), and some mounted electrical components A printed circuit board, or PCB, is used to… … Wikipedia
Battery holder — A battery holder is one or more compartments or chambers for holding a battery or batteries. In the case of dry cells the holder is also usually responsible for making electrical contact. In the case of wet cells cables normally make contact with … Wikipedia

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