En el artículo ,
jkn escribió:

I wonder what the
Friedland wired bellpushes use for a switch

Just bare bent copper contacts, but they've been making them for years
and they're in wide use, and seem to cope ok with our weather. Tried to
google for a pic showing the contacts but couldn't find one.

The little switches in the cheapos are enclosed, which makes them trap
moisture and corrode, presumably.

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