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i beleive they aren't even allowed to be newly-installed nowadays.
They are, but who does it? Nobody. Still, I like them better than the bulky CEE plugs.

The Swiss have an ingenious 3ph plug and socket.

[Linked Image from chius.ch]

It has 3 round pins (L1, N and PE arranged like any Swiss single-phase socket) and two rectangular pins for L2 and L3, so you can hook up both 1- and 3-ph gear.