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1971 having been due to holdouts who are so conservative that to this day they vote* by physically assembling and holding up hands. (this year postponed due to the 'rona).

Despite that, since 1971 there have been 5 female presidents from 3 different parties: Calmy-Rey, Dreifuss, Leuthard, Sommaruga, Widmer-Schlumpf (some having served more than once)

* as they have since 1403 https://www.ai.ch/politik/landsgemeinde