White steel enclosure with full mechanical A/B port selector switch, 2x DB-25F input 1x DB-25F output

Good old LPT printer selector. This selector switch is fully mechanic and therefore true bidirectional link will be established through the A or B port into the output port. Because of this good old Soviet like technology the selector box might have some modern aplication as well. If nothing else one may create an A / B speaker selector out of it.

According to our knowledge and understanding there is a two position 25 pole switch. Expressed in another way, a switch with 25 changeover contacts. Third expression about the switch could be: 3x25 ways to have fun.

There is only one bad thing about this contraption. Due to the fact that it is not genuine Soviet technology you actually can can break it.