Crazy Klein guys, what's this

Re:

If that's the case it would be an odd thing to Klein have made as I've never seen a Klein one before??

Learn something new everyday
 
As above, if for example more than one person is fixing a machine they use their own padlocks on this device. When they finish they remove their padlocks and everyone knows who has finished etc.
 
Re:

used by electricians when they are working on a circuit the can lock rcd or fuse box closed so no one can accidentaly switch power back without having the padlock key
 
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