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Which Plug?

I had my laptop plugged into a bank of 4 sockets in a meeting room. But which socket was I plugged into? I don't want to unplug the projector by accident. Following the cables is harder because they were threaded down the back of the desks, keeping things nice and tidy on the surface.

Luckily I have had this problem before and made an addition to the plug:

Four plugs in a row. One of which is labeled laptop.
Which Plug?
Four plugs in a row. One of which is labeled laptop.
Which Plug?
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Very useful when plugging in in places with other machines that you don't want to unplug by accident.

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