Electronics: Why does this switch have extra pins?

Why does this switch have extra pins?
I hope you found a solution that worked for you :)
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(electronics.stackexchange.com/users/122522/bart-friederichs)Bart Friederichs
(electronics.stackexchange.com/users/101063/chester-gillon)Chester Gillon
(electronics.stackexchange.com/users/57556/hearth)Hearth
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