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Standard 25-pin switch box for manually changing between four devices connected to the same computer or four computers connected to the same device.  The switch box can be used for parallel port devices (LPT), e.g. printers and scanners.  All connectors on the box are 25-pin female. If the box is to be used as a printer switch box, use a switch box cable between the computer and the switch box, and ordinary Centronics printer cables for the printers.

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