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Submitted by: Larix - 2014-08-08

It takes a temporary input (here, the pulled lever opening a door) and "remembers" it - keeps an output (pressure plate) active indefinitely. The output remains active after the input has turned off.

A practical use would be an invader-activated pressure plate which turns the magma pump on or causes the big security drawbridge to raise - and keeps it pumping/raised until a separate "all clear" is sent to turn it back off. This thing here uses the pathing rules of high-speed minecarts for operation and can remember four signals at once, each with its own separate output.