Re: When were switches first used on mains sockets.
Hi,
I have a few olde worlde switch sockets from way back when that have a mechanical interlock between the switch and the earth pin. This was because the socket had no shutters and posed a shock risk.
One of them was made by 'Crabtree' and would only accept their own plugs which had a hollow earth pin with a groove around the base.
Cheers, Pete.
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